SOLUTION: A regular pentagon has sides of 20 cm. An inner pentagon with sides of 10 cm is inside and concentric to the large pentagon. determine the area inside and concentric to the larger

Question 1178372: A regular pentagon has sides of 20 cm. An inner pentagon with sides of 10 cm is inside and concentric to the large pentagon. determine the area inside and concentric to the larger pentagon but outside of the smaller pentagon.
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
For :

The area of the cm :

Area between :

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