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6 September, 04:47

If the diameter of the circle above is 18 in, what is the circumference of the circle?

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  1. 6 September, 05:52
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    Formula of circle:

    C = 2πr

    The radius is half of the diameter, so divide 9 by 2

    18/2=9

    Then plug in 9 as the radius in the formula.

    C = 2π (9)

    Using you calculator multiply 2 by the symbol "π" and 9

    Exact Form is 18π

    Decimal Form is 56.54866776 ...
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