Answer:
you can use a vernier calliper
Explanation:
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)
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.
Explanation: