What is the volume of a prism where the base is a 45-45-90 triangle with a leg of 5 in. when the height is 1.8 in.?

A 45-45-90 triangle has two equal legs, so the base area is (1/2)(5)(5) = 12.5 square inches. Multiply that by the prism’s height: 12.5 × 1.8 = 22.5 cubic inches. The correct choice is 22.5 in³.

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