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10 July, 23:52

The top of a manhole cover is shaped like a circle. The area of the manhole cover is 380 square inches. What is the circumference of the manhole cover, to the nearest inch?

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  1. 11 July, 00:46
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    need to find the radius first

    area = pi*r^2

    380 = PI * r^2

    380/PI = r^2

    r^2 = 121

    r = sqrt (121) = 11 inches

    radius is 11 inches

    now calculate circumference:

    c = 2*PI*r

    C = 2 * 3.14 * 11

    circumference = 69.08 = 69 inches
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