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Anyone know how to do these?

Anyone know how to do these?-example-1

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Yep! First you need to set up an equation. Since pi times the radius squared is equal to the area, you would say that pir^2 = 380.1. Then, you have to take the square root of 380.1 to solve for the radius. This is equal to about 19.5. Finally, divide this number by pi to get the radius by itself. Therefore, your radius is about 6.2.
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User Josh Kupershmidt
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