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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?

 May 4, 2020
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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     

.     

 Aug 28, 2025

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