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8 January, 03:38

The exact area of a circle is 81 pi square inches what are the radius and diameter of the circle

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  1. 8 January, 05:27
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    A=81pi

    Since the formula for area is A=pi*r^2, you know that 81 was their "squared" answer.

    Take the sq. rt. of 81, which is 9. this is your radius.

    Diameter is always double your radius. 9+9=18.
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