SOLUTION: Find Area of a pentagon with radius 9cm

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Question 423495: Find Area of a pentagon with radius 9cm
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Area = nR^2*sin(360/n)/2 for all regular polygons
= 5*81*sin(72)/2
= 202.5*sin(72)
=~ 192.5889 sq cm