1. Exterior Angles of Triangles

2. Relationship Between Exterior and Remote Interior Angles in a Triangle

3. Relationship Between Exterior and Remote Interior Angles in a Triangle

4. Relationship Between Exterior and Remote Interior Angles in a Triangle

5. Summary The sum of the exterior angles of a triangle is 360°.
The measure of an exterior angle of a triangle is equal to the sum of the measures of both remote interior angles.

6. Practice Problem #1

7. Practice Problem #2

8. Practice Problem #3

9. Practice Problem #4

10. Practice Problem #5