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CK-12 Foundation

Ck 12: Geometry: Polygon Similarity Study Guide

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This study guide looks at similar polygons, scale factor (ratio), and triangle similarity.
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Science Struck

Science Struck: Similarity Statement in Geometry With Examples

For Students 9th - 10th Standards
Models how to write a similarity statement about different types of triangles and quadrilaterals.
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Oswego City School District

Regents Exam Prep Center: An Intuitive Notion of Dilation

For Students 9th - 10th Standards
This site offers a very basic discussion of dilations. It explains what a scaling factor is and provides illustrations.
Handout
Geometry Help

Geometry Help: Similar Triangles

For Students 9th - 10th Standards
Explains the basic concept of similar triangles with step-by-step instructions and methods for solving specific problems on your own relating to this topic.
Handout
Varsity Tutors

Varsity Tutors: Hotmath: Similar Figures

For Students 9th - 10th Standards
Find a clear explanation of similar figures. Discusses how they can be transformed through a sequence of rotations, reflections, translations, and dilations. Explanations are supported with illustrated examples.