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28 September, 14:42

What is the exact area of a circle whose diameter is 18 cm? A. 9 straight pi cm2 B. 18 straight pi cm2 C. 36 straight pi cm2 D. 81 straight pi cm2

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  1. 28 September, 14:44
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    The formula for the area of a circle is:

    A=πr²

    We also know that the diameter of a circle is twice the size of its radius

    d=2r

    So if the diameter is 18 ...

    18=2r

    divide both sides by 2

    9=r

    The radius of the circle is equal to 9cm

    Now we can solve for the area

    A=πr²

    A=π9²

    A=π81

    A=81πcm²

    The exact area of a circle whose diameter is 18cm is 81πcm²

    Answer=D
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