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You are here: HomeOnline resources → Geometry

# Geometry games and resources online

This is a long webpage, listing lots of geometry resources. I have grouped them by the subtopics in geometry, so please see the following list. Each topic has resources that fit many grade levels.

 Shapes & polygons   Area & perimeter   Angles   Solids, volume, & surface area Coordinate plane   Congruent transformations   Similar figures   Circle / Pi   Constructions   Pythagorean Theorem General geometry websites   Worksheets   Books   Advanced topics

## Shapes / Polygons

Buzzing with Shapes
Tic tac toe with shapes; drag the counter to the shape that has that amount of sides.
www.harcourtschool.com/activity/buzz/buzz.html

Patch Tool
An online activity where the student designs a pattern using geometric shapes.
illuminations.nctm.org/ActivityDetail.aspx?ID=27

Polygon Matching Game
Learn all the common polygons by playing this fun, timed matching game.
www.mathplayground.com/matching_shapes.html

Shapes Identification Quiz from ThatQuiz.org
An online quiz in a multiple-choice format, asking to identify common two-dimensional shapes. You can modify the quiz parameters to your liking.
www.thatquiz.org/tq-f/math/shapes

Star Polygons Worksheets
Free worksheets for creating different star polygons by connecting the vertices of regular polygons. Also includes a few worksheets with blank regular polygons.
www.childrensbestactivities.com/star-polygons.php

Looking at Polygons
An interactive lesson with explanations and quiz from Absorb Mathematics course written by Kadie Armstrong, a mathematician.
www.absorblearning.com/mathematics/demo/units/KCA007.html

Polygon Sort
Drag and drop the polygons in the correct place in the diagram.

Interactivate! Tessellate
An online, interactive tool for creating your own tessellations. Choose a shape, then edit its corners or edges. The program automatically changes the shape so that it will tessellate (tile) the plane. Then push the tessellate button to see your creation!
www.shodor.org/interactivate/activities/Tessellate

Polygon Playground
Drag various colorful polygons to the workarea to make your own creations!
www.mathcats.com/explore/polygons.html

Tangram puzzles for kids
Use the seven pieces of the Tangram to form the given puzzle. Complete the puzzle by moving and rotating the seven shapes.
www.abcya.com/tangrams.htm

Interactive Tangram Puzzle
Place the tangram pieces so they form the given shape. Uses Java.
nlvm.usu.edu/en/nav/frames_asid_112_g_2_t_1.html

Logic Tangram game
Note: this uses four pieces only. Use logic and spatial reasoning skills to assemble the four pieces into the given shape.
www.mathplayground.com/tangrams.html

Tangram
Interactive tangram pieces. Build your own shapes or try to make the given shapes.
www.crickweb.co.uk/assets/resources/flash.php?&file=tangram

Tangram set
Cut out your own Tangram set by folding paper. Also includes a large gallery of puzzle shapes to make.
tangrams.ca/inner/fold-set

See all the different kinds of quadrilateral "in action". You can drag the corners, see how the angles change, and observe what properties do not change.

Dynamic Rectangle and Parallelogram
Drag the sides of a dynamic parallelogram or a rectangle to explore these concepts.
standards.nctm.org/document/eexamples/chap5/5.3/index.htm

Make free printable worksheets for classifying (idenfitying, naming) quadrilaterals. There are seven special types of quadrilaterals: square, rectangle, rhombus, parallelogram, trapezoid, kite, scalene, and these worksheets ask students to name the quadrilaterals among these seven types.

First, the quest asks you to choose all the quadrilaterals with the given properties. After several of those types of activities follows a quiz.

Investigate the properties of square, rectangle, rhombus, an isosceles trapezoid, and a non-isosceles trapezoid in this dynamic, online activity.
www.glencoe.com/sites/texas/student/mathematics/assets/interactive_lab/geometry/G_08/G_08_dev_100.html

A virtual manipulative that challenges students to "draw" quadrilaterals with specific characteristics by moving vertices on a coordinate grid. Includes some challenging vocabulary, which is explained below the activity, such as orthodiagonal quadrilateral, cyclic, or convex quadrilateral.
www.uff.br/cdme/jcq/jcq-html/jcq-en.html

Properties of Kites
Investigate the interior angles and diagonals of kites with these interactive tools.
www.keymath.com/x3329.xml

 Math Mammoth Early Geometry A self-teaching worktext for 1st - 3rd grade that covers basic shapes, right angle, symmetry, area, perimeter, and solids. Available as an affordable download (\$2.75), and also as a printed copy. => Learn more and see the free samples! See more topical Math Mammoth books

Triangles

Triangle Explorer
Practice calculating the area of a triangle using this interactive tool.
www.shodor.org/interactivate/activities/TriangleExplorer

Classify Triangles Worksheets
Make free printable worksheets for classifying triangles by their sides, angles, or both.
www.homeschoolmath.net/worksheets/classify_triangles.php

Triangle Classification at Cut The Knot
A tutorial and an applet about classifying triangles by their sides and angles. In the applet, you can drag any of the vertices of the triangle, and the applet tells you whether your triangle is acute, obtuse, or right, or equilateral, isosceles, or scalene.
www.cut-the-knot.org/triangle/Triangles.shtml

Rags to Riches: Classify Triangles by Sides and Angles
Answer multiple-choice questions about the angles of a triangle and classification of triangles in a quest for fame and fortune.
www.quia.com/rr/457498.html

Identify Triangles Quiz
A simple multiple-choice quiz about identifying (classifying) triangles either by their sides or angles. You can modify some of the quiz parameters, such as the number of problems in it.
www.thatquiz.org/tq-A/?-j1-l34-p0

Look at the shapes as they go past, and drag them into the right groups (equilateral, isosceles, or scalene triangles, and quadrilaterals with 4 congruent sides, 2 congruent sides, or no congruent sides).
www.bbc.co.uk/bitesize/ks2/maths/shape_space/shapes/play/

Classifying Triangles Game
A fast-paced game where you drag triangles into the correct basket as fast as you can (acute, obtuse, right).
www.math-play.com/classifying-triangles/classifying-triangles.html

## Area and perimeter

Free worksheets for area & perimeter of rectangles
Generate printable & customizable worksheets for area and perimeter of rectangles/squares. Options include images, word problems, writing an expression for area using distributive property, irregular rectangular areas, and more.
www.homeschoolmath.net/worksheets/area_perimeter_rectangles.php

Everything you wanted to know about area and perimeter
Short explanations of how to find the perimeter of simple shapes and the area of rectangles, followed by quizzes on three levels. In perimeter, level two, some side lengths are not given. In level three, you calculate the perimeter of compound shapes. In area of rectangles, level 1 has just rectangles, and levels 2 and 3 have compound shapes made of rectangles.
www.bgfl.org/custom/resources_ftp/client_ftp/ks2/maths/perimeter_and_area/index.html

Shape Explorer
Find the perimeter and area of odd shapes on rectangular grid.
www.shodor.org/interactivate/activities/ShapeExplorer

Math Playground: Measuring the Area and Perimeter of Rectangles
Amy and her brother, Ben, explain how to find the area and perimeter of rectangles and show you how changing the perimeter of a rectangle affects its area. After the lesson, you will use an interactive ruler to measure the length and width of 10 rectangles, and to calculate the perimeter and area of each.
www.mathplayground.com/area_perimeter.html

Math Playground: Party Designer
You need to design areas for the party, such as crafts table, food table, seesaw, and so on, so that they have the given perimeters and areas.
www.mathplayground.com/PartyDesigner/PartyDesigner.html

BBC Bitesize - Perimeter
A simple revision (review) "bite" for perimeter that includes short explanations and a few quiz questions.
www.bbc.co.uk/schools/ks3bitesize/maths/measures/perimeter/revise1.shtml

BBC Bitesize - Area
Brief revision (review) "bites", including a few interactive questions, about area: counting squares, area of rectangles, area of triangles, parallelograms, and of compound shapes. Includes an activity and a test.
www.bbc.co.uk/schools/ks3bitesize/maths/measures/area/revise1.shtml

Geometry Area/Perimeter Quiz from ThatQuiz.org
An online quiz, asking either the area of perimeter of rectangles, triangles, and circles. You can modify the quiz parameters to your liking, for example to omit the circle, or instead of solving for area, you solve for an unknown side when perimeter/area is given.
www.thatquiz.org/tq-4/?-j201v-lc-m2kc0-na-p0

Perimeter Game from Cyram.org
A simple online quiz for finding the perimeter of rectangles, triangles, or compound rectangles where not all side lengths are given.
www.cyram.org/Projects/perimetergame/index.html

FunBrain: Shape Surveyor Geometry Game
A simple & easy game that practices finding either the perimeter or area of rectangles.
www.funbrain.com/poly/index.html

Interactive Geometry Dictionary: Areas in Geometry
The applets will show you how to find the area of some common shapes.
illuminations.nctm.org/ActivityDetail.aspx?ID=21

Triangle Explorer
Practice finding the area of triangles.
www.shodor.org/interactivate/activities/triangle/index.html

XP Math: Find Perimeters of Parallelograms
This online quiz shows you parallelograms and rectangles, and you need to calculate the perimeter, including typing in the right unit, and not using the altitude of the parallelogram.

Area Of Parallelogram
This Java applet and the discussion illustrates where the formula for the area of parallelogram comes from.
www.cut-the-not.com/Curriculum/Geometry/AreaOfParallelogram.shtml

 Math Mammoth Geometry 1 A self-teaching worktext for 4th-5th grade that covers angles, triangles, quadrilaterals, symmetry, solids, perimeter, area, volume, and more. The book uses a lot of "learn by drawing" exercises. Available as an affordable download (\$7.00), and also as a printed copy. => Learn more and see the free samples! See more topical Math Mammoth books

## Angles

Guess the Random Angle
Estimate and guess the angles shown.
www.crickweb.co.uk/assets/resources/flash.php?&file=angle

Guide the ladybug by giving her commands to turn 90° or 45°, right or left, or to move forward/backward.
nlvm.usu.edu/en/nav/frames_asid_287_g_2_t_3.html

Similar to the Ladybug Leaf, but this time you guide the ladybug through the maze.
nlvm.usu.edu/en/nav/frames_asid_141_g_2_t_3.html

Angles
Practice your knowledge of acute, obtuse, and alternate angles, plus relationships between angles such as vertical, adjacent, alternate, same-side, and corresponding.
www.shodor.org/interactivate/activities/Angles

Angle Find!
Click on the angle with the given angle measure within a geometric figure. Three different modes: Easy Cornering, Parallel Play, and Tangled Angles. Practices your ability to estimate angles and your knowledge of vertical angles, corresponding angles, and angles in a triangle.
puzzlezapper.com/aom/mathed/anglefind/anglefind.html

Geometry Bridge
An interactive review lesson on types of angles, types of triangles, angle sum of a triangle, and the Pythagorean Theorem, for 5th-7th grade students. You get to build a bridge!
mysite.verizon.net/vzex2lij

Turtle Pond
Estimate length and angle measure while guiding a turtle to a pond using computer commands.
illuminations.nctm.org/ActivityDetail.aspx?ID=83

Banana Hunt at Primary Games
Help the monkey to find bananas and learn to estimate angles.
www.primarygames.co.uk/pg2/bhunt/bhunt.html

Angles
Practice obtuse/right/acute angles, and vertical/corresponding/alternate interior or exterior angle concepts
www.shodor.org/interactivate/activities/angles/index.html

Working with Angles
An interactive lesson with explanations and quiz from Absorb Mathematics course written by Kadie Armstrong, a mathematician.
www.absorblearning.com/mathematics/demo/units/KCA003.html

Angles in Polygons
An interactive lesson with explanations and quiz from Absorb Mathematics course written by Kadie Armstrong, a mathematician.
www.absorblearning.com/mathematics/demo/units/KCA004.html

Properties of Parallelograms
Investigate the sides and interior angles of parallelograms using these two interactive tools.
www.keymath.com/x3331.xml

Interior Angles
A nice lesson and explanation about interior angles of polygons.
www.coolmath4kids.com/interior.html

MB-Ruler - a triangular ruler for the computer screen
MB-Ruler is a software that helps you to measure distances and angles on the computer screen, such as distances on a map or angles in any image. It has a ruler and a protractor, which are almost transparent over the image you are working with.

 Math Mammoth Geometry 1 A self-teaching worktext for 4th-5th grade that covers angles, triangles, quadrilaterals, symmetry, solids, perimeter, area, volume, and more. The book uses a lot of "learn by drawing" exercises. Available as an affordable download (\$7.00), and also as a printed copy. => Learn more and see the free samples! See more topical Math Mammoth books

## Solids (3-D shapes), volume, and surface area

Identify solids
Select the name and drop it on the correct solid.
www.softschools.com/math/geometry/shapes/solids/games/

2-D and 3-D Shapes
Learn about different solids and see them rotate.
www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/3d

Identify solids
Click to identify the partially buried 3-dimensional shapes.
www.primaryresources.co.uk/online/longshape3d.html

Geometric Solids
Rotate various geometric solids by dragging with the mouse. Count the number of faces, edges, and vertices.
illuminations.nctm.org/ActivityDetail.aspx?ID=70

Cuboid Exploder and Isometric Shape Exploder
These interactive demonstrations let you see either various cuboids (a.k.a. boxes or rectangular prisms) or various shapes made of unit cubes, and then "explode" them to the unit cubes, illustrating volume.

Volume Shoot Game
Shoot (select) the shapes with a given volume in cubic units. They also have more similar geometry games (select/shoot different shapes).
www.sheppardsoftware.com/mathgames/geometry/shapeshoot/VolumeShapesShoot.htm

Interactivate: Surface Area and Volume
Explore or calculate the surface area and volume of rectangular prisms and triangular prisms. You can change the base, height, and depth interactively.
www.shodor.org/interactivate/activities/SurfaceAreaAndVolume

Polyhedra in the Classroom
With this list of internet based activities you can go through a comprehensive study of polyhedra according to objectives of 8th grade.
mathforum.org/alejandre/workshops/unit14.html

Studying Polyhedra
Introduction of the concept, links, great applet illustrating the 5 regular polyhedra.
mathforum.org/alejandre/applet.polyhedra.html

Paper Models of Polyhedra
This site provides hundreds of free printable paper models for various solids, including platonic solids, pyramids, and lots of polyhedra. Some are available as colored versions also.
www.korthalsaltes.com

Geometry Volume/Surface Area Quiz from ThatQuiz.org
An online quiz, asking either the volume or surface area of cubes, prisms, spheres, cyliners, or cones. You can modify the quiz parameters to your liking, for example to omit some shapes, solve only for volume or surface area, or instead of solving for volume/surface area, you solve for an unknown dimension (side or radius) when the volume or surfare area is given.
www.thatquiz.org/tq-4/?-j3vu0-lc-m2kc0-na-p0

Dome Book
Instructions for building geodesic play-domes out of cardboard or plastic. The site includes two free printable dome models and a book that contains plans for constructing nine kinds of domes in any size desired.
www.geo-dome.co.uk/article.asp?uname=geomodel

## Coordinate plane

Billy Bug Returns at Primary Games
Move Billy Bug to the feeding place with given coordinates.
www.primarygames.co.uk/pg2/bug2/bug2.html

Graphit
A graphing tool that plots both functions and ordered pairs.
www.shodor.org/interactivate/activities/graphit/index.html

Graph Mole
A fun game about plotting points in coordinate plane. Plot points before the mole eats the vegetables.
funbasedlearning.com/algebra/graphing/default.htm

Coordinate Grid Quiz from ThatQuiz.org
This quiz has 10 questions and asks to either plot a point or give the coordinates of a given point. You can also modify the quiz parameters to your liking.
www.thatquiz.org/tq-7/?-j8-l5-m2kc0-na-p0

Function Flyer
Create graphs of functions but also allows the manipulation of constants and coefficients in any function so the user can explore the effects on the graph by changing those numbers.  Great tool!
www.shodor.org/interactivate/activities/flyall/index.html

Rate of Change in Linear Functions
These great interactive graphs illustrate the concepts of linearity and slope. The discussions provided help the teacher in how to use them.
standards.nctm.org/document/eexamples/chap6/6.2/index.htm

 Math Mammoth Geometry 2 A self-teaching worktext for 6th-7th grade that covers angle relationships, classifying triangles & quadrilaterals, angle sums, similar figures, congruent transformations, area, pi, volume, surface area, constructions, and unit conversions. The book uses a lot of "learn by drawing" exercises. Available as an affordable download (\$5.80), and also as a printed copy. => Learn more and see the free samples! See more topical Math Mammoth books

## Congruent Transformations

Primary Resources: Reflection
Color the squares and reflect the given pattern in a line.
www.primaryresources.co.uk/online/reflection.swf

Primary Resources: Rotation
From the arrow you can change the shape. Use the circular arrow buttons to rotate the shapes either 90 or 45 degrees.
www.primaryresources.co.uk/online/rotation.swf

Symmetry Game
Tell how many lines of symmetry a shape has.
www.innovationslearning.co.uk/subjects/maths/activities/year3/symmetry/shape_game.asp

Online Kaleidoscope
Create your own kaleidoscope creation with this interactive tool.. www.zefrank.com/dtoy_vs_byokal

Similarity and Congruence
An interactive lesson with explanations and quiz from Absorb Mathematics course written by Kadie Armstrong, a mathematician.
www.absorblearning.com/mathematics/demo/units/KCA035.html

National Library of Virtual Manipulatives for Interactive Mathematics: Geometry
Collection of interactive geometry activities: Congruent triangles, fractals, geoboard activities, Golden rectangle, Ladybug leaf, Ladybug mazes, platonic solids, tangrams, tessellations, transformations and more.
nlvm.usu.edu/en/nav/category_g_3_t_3.html

Symmetries and Their Properties—Lessons from NCTM Illuminations
Ready-to-use online lessons that use interactive Java applets on symmetries:
Rotational symmetry, reflections, translations, and glide reflections.
illuminations.nctm.org/index_o.aspx?id=138

Transformations
Use these interactive figures to explore geometric transformations (rotations, translations, and reflections AND a composition of these).
standards.nctm.org/document/eexamples/chap6/6.4/index.htm

## Similar Figures

Length, Perimeter, Area and Volume of Similar Figures
Use this interactive figure to explore how the scale factor affects the size and the area of similar figures.  The discussion provided helps the teacher, but a specific lesson plan would be more helpful.
standards.nctm.org/document/eexamples/chap6/6.3/index.htm

Ratio and Scale
An interactive lesson with explanations and quiz from Absorb Mathematics course written by Kadie Armstrong, a mathematician. www.absorblearning.com/mathematics/demo/units/KCA024.html

Similar Triangles Quiz from ThatQuiz.org
This quiz has 10 questions and asks to provide a missing side length when two similar triangles are shown. You can also modify the quiz parameters to your liking.
www.thatquiz.org/tq-A/?-jg-l1i-m2kc0-na-p0

 Math Mammoth Geometry 2 A self-teaching worktext for 6th-7th grade that covers angle relationships, classifying triangles & quadrilaterals, angle sums, similar figures, congruent transformations, area, pi, volume, surface area, constructions, and unit conversions. The book uses a lot of "learn by drawing" exercises. Available as an affordable download (\$5.80), and also as a printed copy. => Learn more and see the free samples! See more topical Math Mammoth books

## Circle / Pi

Area of a Circle, Formula & Illustrated Lesson
The interactive tool shows you the area of the circle as the radius increases. The page also includes a short quiz.
http://www.mathwarehouse.com/geometry/circle/area-of-circle.php

Circle Tool
An applet that allows you to investigate how the area and circumference of a circle compare to its radius and diameter in the Intro and Investigation sections and then hone your skills in the Problems section. You can drag the radius to various lengths, and the click the "Add to Table" button to record the data in the table. You can also examine the ratios of any two measures, and make a graph of the data illuminations.nctm.org/ActivityDetail.aspx?ID=116

A simple lesson with an interactive quiz about radius, diameter, and circumference of a circle.
www.mathgoodies.com/lessons/vol2/circumference.html

The Area of a Circle as a Limit
An animation that illustrates how the area of a circle is a limit of the sum of the areas of interior triangles as the number of triangles goes to infinity. This is the idea I explain in this book (Math Mammoth Geometry 2).
www.learnerstv.com/animation/animation.php?ani=96&cat=physics

Area of Circle
An activity where you measure a circle and the resulting figure when you cut it into wedges and tape them together to form a crude parallelogram.
www.learner.org/courses/learningmath/measurement/session7/part_b

Rolling circle illustrating Pi
This is a short animation where a circle with diameter 1 rolls on a number line one complete roll. Of course having rolled once around its circumference, it now lands at 3.14 or Pi.
http://i.imgur.com/dsCw0.gif

Amazing History of Pi
A short and simple introduction to the history of pi.
ualr.edu/lasmoller/pi.html

Approximating Pi
How did Archimedes find the approximate value of pi? This interactive tool illustrates Archimedes' basic approach with inscribed or circumscribed polygons.
www.pbs.org/wgbh/nova/archimedes/pi.html

Two pi-related activities to do at home, plus a lot of fun links about pi. Originally meant for Pi Day (celebrated 3/14 each year).
www.exploratorium.edu/pi/pi_activities

Visualization of the first 4 million digits of Pi
This online visualization represents the first 4,000,000 decimals of Pi within a single image. Each unique digit of Pi corresponds to a specific color, and is rendered as a 1x1 pixel dot. You can also search for the first occurrences of any specific decimal combination.
two-n.com/pi

5 Trillion Digits of Pi
As of August 2010, the world record for computing digits of pi was 5 trillion digits. This will keep changing, of course.
www.numberworld.org/digits/Pi

## Constructions

Geometric Construction
An interactive lesson with explanations and quiz from Absorb Mathematics course written by Kadie Armstrong, a mathematician.
www.absorblearning.com/mathematics/demo/units/KCA006.html

Animated Geometric Constructions
Simple animations that show how to do basic geometric constructions.
www.mathsisfun.com/geometry/constructions.html

Geometric Constructions Illustrated with Interactive Java Applets
Drag various points in the sketch to explore additional cases. Also gives complete directions for using The Geometer's Sketchpad® software to construct the basic geometry constructions.
www.nvcc.edu/home/tstreilein/constructions/contents.htm

Simulations of Ruler and Compass Constructions
Practice compass & ruler constructions interactively online. Hints and solutions included.

## Pythagorean Theorem

Pythagorean Theorem
This interactive figure illustrates the famous theorem and its proof.
standards.nctm.org/document/eexamples/chap6/6.5/index.htm#applet

## General geometry websites

Geometry - Math Warehouse
Detailed lessons about angles, triangles, quadrilaterals, circles, similar triangles, parallelograms, polygons, and trapezoids.
www.mathwarehouse.com/geometry

Geometry course from Learning Math
This online geometry course includes readings, problems, videos, interactive activities, homework problems and solutions. It is meant for K-8 teachers but will work well for middle school students as well.
www.learner.org/courses/learningmath/geometry

Absorb Mathematics
Absorb Mathematics is an excellent interactive course written by Kadie Armstrong, a mathematician. The lessons in it contain interactivity, explanations, and quiz questions. The course concentrates on geometry and trigonometry but includes a few other topics as well. While most of the content is accessible by a fee only, some lessons are available as free samples.

www.absorblearning.com/mathematics/contents.html

BBC Bitesize Shape and space
Short revision (review) "bites" with some activities and short tests for middle/high school level. Topics include shapes, angles, transformations, lines, polygons, symmetry, circles, Pythagorean Theorem, and constructions.
www.bbc.co.uk/schools/ks3bitesize/maths/shape_space

Geometry Homework Help from Math.com
Basic tutorials and quizzes on common geometry topics found in middle and high school.
www.math.com/homeworkhelp/Geometry.html

Geometry Reference Sheet
Both online and printable versions; includes area and volume formulas for common shapes plus Pythagorean Theorem.
www.ecalc.com/math-help/worksheet/geometry

Geometry Tutorials
Simple tutorials on triangles and their properties, polygons, symmetry, angles and much more. Also includes lots of solved geometry questions and some interactive applets.
www.analyzemath.com/geometry.html#tutorials

Dynamic Geometry® Explorations
A bunch of interactive geometry activities, along with instructions and questions to guide your exploration. Need a Java-enabled browser.
www.keymath.com/DG/dynamic/index.html

National Library of Virtual Manipulatives for Interactive Mathematics: Geometry
Collection of interactive geometry activities: Congruent triangles, fractals, geoboard activities, Golden rectangle, Ladybug leaf, Ladybug mazes, platonic solids, tangrams, tessellations, transformations and more.
nlvm.usu.edu/en/nav/category_g_3_t_3.html

Great Pyramid
Clear instructions on how to make a scale model of the Great Pyramid at Giza out of paper.
mathforum.org/alejandre/mathfair/pyramid2.html

 Math Mammoth Geometry 2 A self-teaching worktext for 6th-7th grade that covers angle relationships, classifying triangles & quadrilaterals, angle sums, similar figures, congruent transformations, area, pi, volume, surface area, constructions, and unit conversions. The book uses a lot of "learn by drawing" exercises. Available as an affordable download (\$5.80), and also as a printed copy. => Learn more and see the free samples! See more topical Math Mammoth books

## Worksheets

Worksheets and lesson plans: Shape and Space
Worksheets about angles and shapes and a few other geometry topics in PDF/doc/ppt form.

Math Mammoth Geometry Worksheets Collection
A collection of quality worksheets with variable problems for grades 3-7. Sold as a download or printed book.
www.mathmammoth.com/worksheets/geometry.php

Geometry worksheets & quizzes
A bunch of PDF worksheets on geometry topics for elementary level, plus online quizzes.
www.math4children.com/Topics/Geometry

Geometry worksheets & quizzes
Worksheets about complementary and supplementary angles, parallel, perpendicular, and intersecting lines, types of angles, basic shapes, area & perimeter of rectangles, and parts of a circle.

Maisonet Math
Worksheets and online quizzes on a variety of geometry (and other) topics. Look for the links in the left sidebar for Angles, Area, Circumference, Geometry, Transformations, and Volume.
www.mrmaisonet.com

Math Mammoth Geometry Worksheets Collection
A collection of quality worksheets with variable problems for grades 3-7. Sold as a download or printed book.
www.mathmammoth.com/worksheets/geometry.php

High School Measurement Worksheets and Geometry Worksheets
From FunMaths.com website, written by teachers from all over the world.
www.funmaths.com/worksheets/math_measurement_06.htm and
www.funmaths.com/worksheets/math_geometry_02.htm

Let's Practice Geometry
Lots of free geometry worksheets for high school. Includes worksheets for the basics, Pythagorean Theorem, perimeter, area, and volume, angles, triangle theorems, similarity and congruence, logic, proofs, trig, polygons, and circles.
www.letspracticegeometry.com

Geometry worksheets at AGMath.com
Hundreds of free PDF worksheets for high school geometry topics, loosely based on the "Discovering Geometry" textbook by Michael Serra. Compiled by Jason Batterson, an 8th grade, algebra, geometry, and MathCounts teacher.
AGmath.com/1973.html

## Books

Math Mammoth Geometry 1
A textbook/workbook together for grades 3-5, written by the owner of this site. You will learn geometry by drawing. Topics covered include angles, rectangles, parallelograms, polygons, circles, area, perimeter, and volume. Price: \$7.00 download, \$12.70 printed.
www.mathmammoth.com/geometry_1.php

Math Mammoth Geometry 2
A textbook/workbook together for grades 6-7, written by the owner of this site. It continues the study of goemetry after Math Mammoth Geometry 1, continually emphasizing conceptual understanding, besides calculation-type exercises. Price: \$5.80 download.
www.mathmammoth.com/geometry_2.php

Geometry: A Guided Inquiry
An excellent choice for high school geometry. I've written an in-depth review of this book and of its supplement Home Study Companion - Geometry, latter by David Chandler.

Harold Jacobs Geometry
A popular choice for geometry among homeschoolers, and well written. Please read my review.

Kiselev's Geometry / Book I. Planimetry
A famous Russian geometry book translated. Acclaimed for the clarity of exposition which makes the book accessible for 7th graders.

A High School First Course in Euclidean Plane Geometry
This is a high school geometry course by Charles Aboughantous. It is based on Euclid's five postulates and his most common theorems. It promotes the art and the skills of developing logical proofs. Practice problems are included at the end of each chapter in three groups: geometric construction problems, computational problems, and theorematical problems. The answers to the computational problems are included at the end of the book. The solutions manual of the book contains detailed solutions to all the problems in the book. It is free to home schooled students upon proof of purchase of the book. Samples are found at http://home.earthlink.net/~draboughantous/geometry.html

Kiselev's Geometry / Book I. Planimetry
A famous Russian geometry book translated. Acclaimed for the clarity of exposition which makes the book accessible for 7th graders.

Dr. Math Presents More Geometry
An inexpensive companion to any high school geometry course with excellent explanations. Read my review.

Go Geometry
All things geometry: geometry theorems, huge list of geometry problems, presented with visual diagrams, geometric art, puzzles, dynamic geometry, and more.
gogeometry.com

Why is High School Geometry so Difficult  A HomeschoolMath.net article
And what to do about it. In this article, I investigate the reasons and remedies for why so many students find their high school geometry course to be difficult.
www.homeschoolmath.net/teaching/geometry.php

Tim's Triangular Page
Lists all the basic facts about triangles followed by some problems.
sakharov.net/triangle.html

How to Write a Solution
An article exploring aspects of how to write a clear solution - or proof. Meant for college students but helpful for anyone who wants to learn to write mathematical proofs.
www.artofproblemsolving.com/Resources/AoPS_R_A_HowWrite.php

Euclid's Elements
A set of Java applets that bring to life the theorems in Euclid's Elements.
aleph0.clarku.edu/~djoyce/java/elements/elements.html

NonEuclid
Interactive Java software for creating ruler and compass constructions in both the Poincaré disk and the upper half-plane models of hyperbolic geometry. See also, Why is it Important for Students to Study Hyperbolic Geometry?
cs.unm.edu/~joel/NonEuclid/NonEuclid.html

New! Times Tales is now on DVD!

The fast, FUN, and easy way to learn multiplication. Learn the upper times tales in two sittings using mnemonic stories.