SOLUTION: On Martin's car the total length of the windshield wiper arm, plus the blade, is 31 inches and it turns through a 110 degree angle. If the blade alone is 18 inches long to the near

Algebra ->  Algebra  -> Trigonometry-basics -> SOLUTION: On Martin's car the total length of the windshield wiper arm, plus the blade, is 31 inches and it turns through a 110 degree angle. If the blade alone is 18 inches long to the near      Log On

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Question 158046: On Martin's car the total length of the windshield wiper arm, plus the blade, is 31 inches and it turns through a 110 degree angle. If the blade alone is 18 inches long to the nearest square inch how much area of the windshield is cleaned by the wiper blade?
Answer by joey_quizan(15) About Me  (Show Source):
You can put this solution on YOUR website!
Sol:
A=Total Area
A=2*31*3.1461*(110/180)=119 sq.in.
a=area cleaned by wiper
a= 119-2*(31-18)*3.1461*(110/180)
Ans: a= 69 sq.in.