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11 February, 02:13

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

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  1. 11 February, 03:24
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    The correct answer is 81.

    Step-by-step explanation:

    To find the area of the coin/a circle use this equation:

    (a = area, r = radius, d = diameter)

    a = r²

    So we need to do for the radius.

    r = d/2

    r = 18/2

    r = 9

    Then solve

    a = 9²

    a = 81
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