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12 February, 05:12

A wheel has a diameter of 21 inches. About how far does it travel if it makes 30 complete revolutions?

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  1. 12 February, 07:22
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    You can use the circumference of a circle, that is

    C = 2 π (d/2)

    The one revolution of a wheel is

    C = 2 π (21/2) = 21 π in

    For 30 complete revolutions, you will get

    30 (21 π) = 630 π in = 1979.20 in
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