Exterior Angles Theorem
- Joseph Rudin III
What is an exterior angle?
Interior and Exterior Angles Examples
Explore Exterior Angles
Answer the following questions.
What do you notice about each exterior angle and the interior angle it is connected to (the adjacent interior angle)? What do they form?
What do you notice about the measure of the interior angles not connected (the non-adjacent interior angles) to an exterior angle?
The Exterior Angle Theorem
Based on your observations, the Exterior Angle Theorem would be as follows: (fill in the blanks) The measure of an exterior angle of a triangle is _______________________ of the measures _____________________.