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26 September, 09:46

Find the circumference and area of a circle with diameter of 21 inches

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  1. 26 September, 10:18
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    To solve for the circumference and the area of a circle, first you must determine the radius.

    D = 21 inches

    R = 1/2D = 1/2 (21) = 10.5 inches.

    C = 2pi • r

    C = 2 (3.14) • 10.5 inches

    C = 65.97 inches.

    A = Pi • r ^2

    A = (3.14) • 10.5^2

    A = 346.185 in^2.

    The area of a circle is 346.185 in^2.
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