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Can someone help me please? i'm not sure if 4 is right and i don't understand how to do 3

Can someone help me please? i'm not sure if 4 is right and i don't understand how-example-1
User Neojakey
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3 Is B. The formula for finding the area of a circle is A= r(to the second power) times Pi. The radius is 6, so you must do 6 to the second power which is 6 times 6. That is 36. Your answer will be 36 pi. 
User Calamity Jane
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