### Home > GC > Chapter 8 > Lesson 8.3.1 > Problem 8-85

8-85.

*C* is the center of the pentagon. Homework Help ✎

Try dividing the pentagon into congruent triangles. What trig ratio can you use to find the area of one of these triangles?

Use the area of one triangle as a starting point to find the area of the shaded region.