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Similar figures: online activities and resources

This is hand-picked list of online activities and tutorials for similar figures in geometry.

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.

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.

Let's Practice Geometry - Free Worksheets
Lots of free worksheets for high school geometry, including topics such as the Pythagorean Theorem, perimeter, area, volume, angle relationships, triangle theorems, similarity and congruence, logic, proofs, trig, polygons, and circles.

Key to Geometry workbook series

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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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.

Maisonet Math - Transformations Worksheets
Free PDF worksheets about dilations & scale factor, rotations, reflections, and all transformations.

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 a geometry textbook among homeschoolers, and well written. Please read my review.

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