Lesson: Exterior Angles of a Triangle Mathematics • 8th Grade

In this lesson, we will learn how to find the measure of the exterior angle of a triangle and compare between an exterior angle and its corresponding remote interior angles.

Lesson Video

Sample Question Videos

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Lesson Worksheet

Q1:

What is the sum of the measures of the exterior angles of a triangle?

Q2:

Is , , or ?

Q3:

The figure shows some angles identified on triangle .

Identify which angle is an exterior angle.

Identify which angle is an interior angle.