The cross sectional area of a discontinuity in forging is greater than the area of the 0.08 in. flat bottom hole. Which option correctly represents this statement's placement among choices?

• A. The same as the area of the 0.08 in. flat bottom hole
• B. Greater than the area of the 0.08 in. flat bottom hole
• C. Slightly less than the area of the 0.08 in. flat bottom hole
• D. About 1/2 the area of the 0.08 in. flat bottom hole

Answer: (B)

A cross-sectional size comparison is the key idea here. A 0.08 in flat-bottom hole is a very small feature, and its cross-sectional area is A = πd^2/4 ≈ π(0.08)^2/4 ≈ 0.005 in^2. Forging discontinuities—things like porosity pockets, laps, or voids—typically present as sizeable cross sections in the material. When you compare, the discontinuity’s cross-sectional area would be greater than that of such a small reference hole, so the statement that the area is greater than the 0.08 in hole best describes the true relationship. The other options imply the flaw is about the same size, slightly smaller, or roughly half as large, which doesn’t align with how these discontinuities commonly appear in cross section.