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8 April, 08:45

The radius of a circle is 3 feet. What is the length of a 180° arc?

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  1. 8 April, 09:07
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    S = r*theta

    s = arc length

    r = radius

    theta = angle measure in radians. If given in degrees you must change to radians.

    s = 3 * 180 * (pi/180)

    s = 3 pi ft.

    This is the exact value.

    s = 9.42 ft. Is the decimal approximation.
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