Asked by Sarah Fuller
A rear windshield wiper on a car has a total arm length of 10 inches and rotates back and forth through an angle of 95 degrees. The actual wiper blade is 7 inches long. Find the area of thr windshield that is being cleaned.
Answers
Answered by
drwls
Take (95/360) of pi*[10^2 -3^2]
Do you see why?
Imagine a 10 inch radius circle with a concentric 3 inch radius circle taken out of the middle. The radial distance from the smaller to the larger radius is 7 inches. Your area is a 95 degree segment of that full circle.
Do you see why?
Imagine a 10 inch radius circle with a concentric 3 inch radius circle taken out of the middle. The radial distance from the smaller to the larger radius is 7 inches. Your area is a 95 degree segment of that full circle.
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