Geometry/Chapter 4

Lessons

 * Lesson 1 - Introduction to triangles and classifying triangles by angles.
 * Lesson 2 - Classifying triangles by their sides and the Triangle Angle-Sum Theorem.
 * Lesson 3 - Exterior Angles, collaries and [intro to] finding x problems.
 * Lesson 4 - Isosceles Triangles.
 * Lesson 5 - Congruent Triangles.
 * Lesson 6 - Pythagorean Theorem.
 * Lesson 7 - Geometric Mean
 * Lesson 8 - Finding the altitude of a triangle
 * Lesson 9 - Special Right Triangles