Question

A metal washer 1-inch in diameter is pierced by a 1/2 - inch hole. What is the volume of the washer if it is 1/8 - inch thick?

Answer 1

If you are saying the washer is 1/8" thick, then its volume is (1/8)(π/4 - π/16) = 3π/128 in^3 

Numerically, the volume is 0.07363 cubic inches

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