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What you need is the area of the circle. Area = Pi x r squared where r is the radius.
The radius is one-half the diameter so in this case r=15 to square it, multiply it by itself ( 15 x 15 ) so r squared =225 now multiply that by 3.14 . Ans: 706.5 square inches.
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A circle with an 8-inch diameter has a perimeter of 25.1 inches.
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