Question 182421
A car's rear windshield wiper rotates 120 degree's, find the area covered by the wiper. the wiperblade length is 25 and the width of the covered area is 14.
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A circle with radius 25 has area (pi)625
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A circle with radius (25-14) = 11 has area (pi)121
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If the wiperblade covered 360 degrees the covered area 
would be 625(pi)-121(pi) = 504(pi) sq units
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Since the blade sweeps only 120 degrees the area is 
(1/3)504(pi) = 168(pi)sq units
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Cheers,
Stan H.