What is the circumference on a piece of 6 inch schedule 40 pipe?

The circumference of a 6-inch schedule 40 pipe can be calculated using the formula ( C = \pi \times d ), where ( d ) is the outside diameter. For a 6-inch schedule 40 pipe, the outside diameter is approximately 6.625 inches. Thus, the circumference is about ( C \approx \pi \times 6.625 \approx 20.82 ) inches.