GED® Geometry: Angles, Lines & Triangles

A deep GED® Geometry course on angles, lines, and triangles. Students learn to measure and classify angles, use complementary, supplementary, vertical, and parallel-line angle relationships to find missing angles, classify triangles by their sides and angles, and apply the triangle angle sum, exterior-angle, and isosceles rules. Every relationship has a labeled diagram, every lesson has an interactive self-check, and every practice answer explains the method and adds a Pro tip.