We’ve written about shaded region problems before (here and here) and recently offered up a challenging problem (here) on this topic. Here’s another problem that will put your math brain to work. Give it a try!

In the diagram below, segment *AB* is tangent to the circle at Point *A*. The measure of ∠*OBA *is 30 degrees and the circumference of the circle is 8π units. What is the area, to the nearest tenth of a square unit, of the shaded region?

A. 4.8

B. 5.5

C. 5.8

D. 6.0

E. 6.1