Answer:
use a rope and tie it around the cylinder and make such you notice the two meeting points of your rope, which you use as a measuring tool, then you took the marked rope and you stretch it on a tape measure and there you get your reading from the tape measure.
Step-by-step explanation:
you can use a vernier calliper
or you can calculate the circumference of the cylinder then, Then divide that amount by π
OR
measure the diameter divide it by two(2)
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