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23 June, 15:00

Find the area and circumference of a circle. Find the radius or diameter of a circle when given the area of circumference?

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  1. 23 June, 15:18
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    Area = πr²

    Circumference = 2πr

    Step-by-step explanation:

    When given the radius r,

    Area of a circle A = πr²

    Circumference of the circle C = 2πr

    When given diameter d,

    Area of a circle A = πd²/4

    Circumference of a circle = πd

    To find the radius r and d from area A,

    r = sqrt (A/π)

    d = sqrt (4A/π)

    To find the radius r and diameter d from a given circumference C,

    r = C / (2π)

    d = C/π

    Where d = 2r
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