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Some links are repeated for use with more than one lesson.

9.1  Basic Geometric Figures

Angles

This site allows students to discover the properties of angles.

Lines and Angles

This site has examples and problems for students to solve that involve lines and angles.

9.2  Angles

Angles

This site allows students to discover the properties of angles.

Lines and Angles

This site has examples and problems for students to solve that involve lines and angles.

9.3  Triangles

Triangles

This site defines triangles and explains how to classify them.

9.4  Polygons

Quadrilaterals and Other Polygons

This site has examples and problems for students to solve that involve quadrilaterals and other polygons.

Polygon Basics

This site defines polygons and its components and has a table of the properties of polygons with up to 10 sides.

9.5  Congruence

Congruent Triangles

This site allows students to discover the properties of congruent triangles.

9.6  Translations

Transformations

This site has examples and problems for students to solve that involve transformations.

9.7  Reflections

Transformations

This site has examples and problems for students to solve that involve transformations.

9.8  Rotations

Transformations

This site has examples and problems for students to solve that involve transformations.