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7 February, 06:46

How do you calculate the circumference of a circle if you know the are

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  1. 7 February, 06:51
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    C = 2√ (Aπ).

    Step-by-step explanation:

    The area A = π r^2 where r = radius

    and the circumference = 2 π r.

    From the formula for the area r = √ (A / π)

    So the circumference is found by substituting in C = 2 π r for r:

    C = 2 π √ (A / π)

    C = 2√ (Aπ).
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