### Home > GC > Chapter 8 > Lesson 8.1.5 > Problem 8-55A

8-55A.

Review the Math Notes box in Lesson 8.1.4 for help determining the sum of the interior angles of a polygon.

*x* = 60°

*x* = 82°

10*x* + (8*x* − 16) + (12*x* − 8) + ... = ?

How is ∠*x* and the missing angle in the shape related?

What relationship do they have?