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216. As shown in the illustration, a section of standard weight, seamless steel pipe, has an external diameter of 4.0 inches. When the pipe, is bent into a 90-degree turn, the length of the outside edge of the curve «A-B» will exceed the length of the inside edge of the curve «C-D» by __________
The difference in length between the outside and inside edges of the 90-degree bend is equal to one-quarter of the circumference based on the pipe's diameter, which is (π * 4 inches) / 2, resulting in approximately 6.28 inches.
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