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18 June, 12:01

If r is the radius of a circle and d is its diameter, which of the following is an equivalent formula for the circumference C=2πr?

A. C=2πd

B. C=πD

C. C=πr2

D. C=πdr

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Answers (2)
  1. 18 June, 12:11
    0
    The answer is B. C=πD
  2. 18 June, 15:16
    0
    The answer is indeed B but let me give you the procedure so that you know why is it that:

    c=2*pi*r

    2r=d

    so

    c=pi*d

    I hope this clarifies everything.
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