Area
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) More geometry lessons 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 (454590, 306090) Side Lengths of Triangles The Triangle Inequality Theorem 
