how can you measure the circumference of a cylinder without making any calculations?

Answer 1

take a roll of string, yarn, or anything of the sort around the outside. Measure the length with a ruler, tapemeasure, etc..

Answer 2

By using a measuring tape rather than a straight ruler. You could also roll the cylinder on a flat plane, like a piece of paper and mark one revolution, then measure the distance on the paper.

Answer 3

Wrap a tape around it, a cloth tape, then subtract three time the thickness of the tape.
Put a mark on the cylinder, a mark on a paper, line up the two marks, roll the cylinder until the mark hits the paper again, and measure between the marks.

Answer 4

If one has an actual physical object, one can measure it directly by wrapping a flexible tape measure around it.

Answer 5

lay a string around the circle then remove it and measure the length or if you have super good map reading skills ,and or good eye hand cordination you can actually rotate a ruler around the circle, but I dont recomend it because one twitch and its done.

Answer 6

cross section x height/length