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# Interactive online lessons and tools for geometric constructions

This is an annotated list of online tools and lessons that help students with geometric 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
Interactive applets and instructions for doing the basic geometric constructions online.
www.personal.psu.edu/dpl14/java/geometry/

RoboCompass
An interactive online environment where you can draw using virtual compass, ruler, and protractor in a coordinate grid. Robocompass uses a total of 22 drawing commands, such as draw a point, draw a perpendicular line, find an angle, reflect an object, and so on.
www.robocompass.com

#### Key to Geometry Workbooks

Here is a non-intimidating way to prepare students for formal geometry. Key to Geometry workbooks introduce students to a wide range of geometric discoveries as they do step-by-step constructions. Using only a pencil, compass, and straightedge, students begin by drawing lines, bisecting angles, and reproducing segments. Later they do sophisticated constructions involving over a dozen steps-and are prompted to form their own generalizations. When they finish, students will have been introduced to 134 geometric terms and will be ready to tackle formal proofs.

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GRACE - Graphical Ruler and Compass Editor
An interactive online tool that allows dynamic creation and modification of ruler and compass constructions. Constructions may be built from one of five geometric primitives (Line, Line Segment, Ray, Circle, Perpendicular Bisector, and Intersection), and from other constructions; thus constructions may be built by composing more basic constructions.
www.cs.rice.edu/~jwarren/grace/

Math Mammoth Geometry Worksheets Collection
A collection of worksheets with variable problems for grades 3-8. Topics include angle relationships, triangles, quadrilaterals, congruency, similar figures, constructions, area, volume, and the Pythagorean Theorem. Price: \$9.00 download.
www.mathmammoth.com/worksheets/geometry.php

Geometry worksheets at AGMath.com
Hundreds of free PDF worksheets for high school geometry topics, including geometric constructions, triangle congruence, circle, area, the Pythagorean Theorem, solid geometry, and similarity. The worksheets are loosely based on the "Discovering Geometry" textbook by Michael Serra. Compiled by math teacher Jason Batterson.
AGmath.com/1973.html