The radius is half of the 4 inch diameter. Therefore, the radius is 2 inches.
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The cross-sectional area of a pipe can be calculated using the formula for the area of a circle, A = πr^2, where r is the radius of the pipe. Since the diameter of the pipe is given as 4 inches, the radius would be half of the diameter, so r = 2 inches. Plugging this value into the formula, we get A = π(2)^2 = 4π square inches. Therefore, the cross-sectional area of the 4-inch pipe is 4π square inches.
The answer depends on what the "36 inch" measures: inside circumference, radius, diameter?
6 inch or 4 inch if it's a short radius
Pipe with a Nominal Bore of 4 inch (100mm) Outside Diameter 114.3mm