Why do triangle angles always sum to 180°?

In this lesson you will learn about the interior angles of triangles by looking at their properties.

Let’s Review The three angles of a triangle always sum to 180° = = = = 180

A line that passes through parallel lines is called a transversal.

Transversals create special angle properties. Alternate Exterior AnglesCorresponding Angles Alternate Interior Angles

Core Lesson Triangles share many of these angle relationships

Find the missing angle measurement. x = = 23 x = 23°

In this lesson you have learned about the interior angles of triangles by looking at their properties.