Question

If we place a hollow ring one above another then , what will we get by adding the circumeference from top to bottom

Answer 1

if we place a hollow ring one by one we get the shape of cylinder...
the shape of top and bottom is circle...
circumference of top(circle)=2πr
circumference of bottom(circle)=2πr
if we add top and bottom we get 4πr..
if my answer is wrong ❌ then please rectify it...