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11 March, 08:16

a certain coin is a circle with a diameter of 18mm what is the exact area of either face of a coin in terms of Pi

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  1. 11 March, 08:47
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    81 pi

    Step-by-step explanation:

    formula for area of a circle-pi times radius squared

    18/2=9

    9 squared 81

    answer-81 pi
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