Points A, B, C, and D are the vertices of a square. Points E and F are the center of two congruent semicircles that are tangent
to each other at point G. Which value is closest to the area of the shaded regions? 
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Hi there! :)
Find the central angle using a ratio in regards to angle and circumference.
The radius is 27 units, so use the following equation to calculate circumference:
C = 2rπ
Therefore:
C = 2(27)π = 54π
Since we have the total circumference, we can write the following proportion:
Cross multiply:
54πx = 6480π
Divide both sides by 54π to isolate for x:
x = 120°