They can measure the circumference of the pipe and divide it by pi or 3.14 to get an approximate answer
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diameter times 3.14159
To find the outside diameter of a pipe with a circumference of 870 mm, you can use the formula for circumference, which is C = πd, where C is the circumference and d is the diameter. Rearranging the formula gives d = C / π. Substituting the values, the diameter is approximately 870 mm / 3.14, which is about 277.5 mm. Therefore, the outside diameter of the pipe is approximately 277.5 mm.
The pipe will have an outside diameter of 1.5+.25+.25 = 2". A pipe with an outside diameter of 2" has an outside circumference of 2"*Pi. 2"*3.142 ~= 6.284" or about 6 1/4"