The area of a shaded sector of the circle is 108pi square centimeters. Given an arc measure of 120, what is the length of the radius in centimeters?
The area of a shaded sector of the circle is 108pi square centimeters.
Given an arc measure of 120, what is the length of the radius in centimeters?
Area of the 120o sector = 108 π
120o is 1/3 of a circle, so the area of the entire circle = 3 • 108 π
A = π r2 ——>> π r2 = 324 π
r2 = 324
r = sqrt(324)
r = 18
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