Free geometry lessons and help for students learning about area, angles, triangles, and more.
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Area and Perimeter
Area vs. Perimeter Area of a Circle Area of a Triangle Angles Complementary and Supplementary Angles Vertical Angles The Exterior Angle Theorem (Exterior and Remote Interior Angles) Parallel Lines Cut by a Transversal: Identifying Angle Pairs More geometry help and lessons are coming soon! Have a request for a particular topic? Send me a message. |
Similar and Congruent Triangles
Scale Factors of Similar Figures Solving Proportions Triangle Congruence Postulates (SSS, SAS, ASA, AAS) Right Triangles The Pythagorean Theorem Converse of the Pythagorean Theorem Special Right Triangles (45-45-90, 30-60-90) Other Points, Lines, Line Segments, Rays and Angles The Distance Formula The Midpoint Formula The Triangle Inequality Theorem |
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