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9 March, 12:08

If a circle has a circumference of 10piπ cm, what is its area?

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  1. 9 March, 13:31
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    Circumference of a circle formula: c=2πr where

    c = circumference

    r = radius

    So here, we have c = 10π.

    Divide 10 by 2 and we get a radius of 5; c=2π (5).

    Area of a circle formula: a = πr² where

    a = area

    r = radius

    Plug in 5 for radius.

    a = (5²) π

    a = 25π

    a ≈ 78.5398
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