### Home > GC > Chapter 8 > Lesson 8.1.2 > Problem 8-17

8-17.

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 ∠*d*.

If a quadrilateral can be made into two triangles, what is the sum of the interior angles of a quadrilateral?

*a* = 87º, *b* = 83°, *c* = 96° *d* = 94º,

∠*a* + ∠*b* +∠*c* + ∠*d* = 360°