automobiles suppose the arm of a windshield wiper is 16 in. long, with a blade 12 in. long. if the wiper moves through an angle of 90, how much of the windshield is cleaned in one pass of the wiper ?

Answer 1

1/4 of a complete circle, so

π/2 (16^2 - 12^2) in^2

that's assuming that the blade extends to the end of the wiper arm.

how do you now what automobiles suppose?