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

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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.
User Shalonteoh
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