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11 February, 12:57

What is the circumfrenece of 21 inches

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  1. 11 February, 12:59
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    Circumference = 2 * (radius) * pi

    radius = 21

    Circumference = 2 * 21 * pi

    = 42*pi or 131.947 (if using actual pi) or 131.88 (if estimating 3.14)
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