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An official tournament- size dartboard has a radius of 9 in. Find its circumference to the nearest whole numbe

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please help need it by april16,2008

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  1. circumference=(pi)(diameter)

    diameter=radius times 2

    so...

    9x2=18

    the diameter is 18

    which makes the circumference 18pi

    which simplifies to 56.549...

    or, to the nearest whole number, 57 inches

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