A cars rear windshield wiper rotates 140 The total length of

A car\'s rear windshield wiper rotates 140°. The total length of the wiper mechanism is 22 inches and the length of the wiper blade is 16 inches.

Solution

I undersytand the question is: Find the area covered by the windshield wiper

we have a wedge of two circles to consider, one with a radius of 22\" and another with a radius of 16\"

area covered by the windshield wiper = area covered by wiper mechanism - area covered by wiper blade

= (140/360)*pi{ 22^2 -16^2]

= 278.55 inch^2