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The volume of a cylinder is the product of the area of the base multiplied by the height. A washer is a portion of cylinder, and if the cylinder specified by the problem had no hole, its volume would be pi X (1/2)2 X 1/8 = pi/32 = about 0.09817 cubic inches. The volume of the actual washer is this value minus the volume of the hole, which is pi X (1/4)2 X 1/8 = pi/128 = about 0.024554 cubic inches. Therefore, the volume of the washer is about 0.09817 - 0.024554 = about 0.0736 cubic inches.

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Q: A metal washer 1 inch in diameter is pierced by a one half inch hole what is the volume of the washer if it is one eight inch thick?
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