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7 August, 04:38

A certain coin is a circle with diameter 18mm. What is the exact area of either face of the coin in terms of

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  1. 7 August, 08:04
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    Area=pir^2

    d/2=r

    given

    d=18

    d/2=18/2=9

    area=pi9^2=81pi mm²

    the exact value is 81π mm²
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