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Home > CCG > Chapter 8 > Lesson 8.1.2 > Problem 8-18


The exterior angles of a quadrilateral are labeled , and in the diagram below. Find the measures of  and and then find the sum of the exterior angles. Homework Help ✎

The missing exterior angles each form a straight angle with an interior angle.
What is the measure of a straight angle?

You will need to find the angle that forms a linear pair with .
If a quadrilateral can be made into two triangles, what is the sum of the interior angles of a quadrilateral?