SOLUTION: What is the exact area of a circle with a diameter of 21 inches? Please help if you can! Thank you.

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Question 480322: What is the exact area of a circle with a diameter of 21 inches? Please help if you can! Thank you.
Answer by Edwin McCravy(20059)   (Show Source): You can put this solution on YOUR website!


The radius r is  the diameter, which is 21,
so the radius r = 














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