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8 October, 10:00

A bicycle wheel has a diameter of 21 inches. What is the circumference of this wheel? What is the radius

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  1. 8 October, 10:16
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    C = 65.97 in; r = 10.5 in

    Step-by-step explanation:

    The circumference is C = πd. Since the diameter is 21 in, the circumference is C = (3.14) (21 in) = 65.97 inches.

    The radius is half the diameter:

    r = (21 in) / 2 = 10.5 in
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