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29 April, 18:33

What is the circumference of the circle? r=6.4

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  1. 29 April, 21:19
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    C = 40.2124

    Step-by-step explanation:

    The formula for circumference is

    C = 2*pi*r

    where r is the radius.

    Substitute what we know.

    C = 2 * pi * 6.4

    C = 12.8 * pi

    If we use substitute pi in, we get

    C = 40.2124
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