What is the cross-sectional area, in square inches, of a pipe with a 12-inch diameter?

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Multiple Choice

What is the cross-sectional area, in square inches, of a pipe with a 12-inch diameter?

Explanation:
For a pipe, the cross-sectional area is the area of the circular opening. Use the circle area formula A = πr^2. The radius is half the diameter, so r = 6 inches. Then A = π(6)^2 = 36π square inches, which is about 113.1. Rounding to the nearest integer gives 113 square inches, the option that matches. The exact value is 36π, not 144, 72, or 36, since those would come from misapplying the radius or skipping the π factor.

For a pipe, the cross-sectional area is the area of the circular opening. Use the circle area formula A = πr^2. The radius is half the diameter, so r = 6 inches. Then A = π(6)^2 = 36π square inches, which is about 113.1. Rounding to the nearest integer gives 113 square inches, the option that matches. The exact value is 36π, not 144, 72, or 36, since those would come from misapplying the radius or skipping the π factor.

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