TRIANGLES
by Ngoc Trinh Tran

1. Inscribed Triangles
2. Circumscribed Triangles
3. Definition
3.1. Task
3.2. Prerequisites
4. Properties of Triangles
4.1. Having 3 sides & 3 angles
4.2. All triangles are convex
4.3. 3 interior angles add to 180°
4.4. Measure of an exterior angle equals the sum of the measures of the two non-adjacent interior angles
4.5. The acute angles of a right triangle are complementary
5. How to Identify A Triangle
5.1. Types of Triangles
5.1.1. Classify by Sides
5.1.2. Classify by Angles
5.2. Measure a Triangle
5.2.1. Perimeter
5.2.2. Area