Question

A rectangular piece of paper of width 30 cm and length 77 cm is rolled along with its width,to form a cylinder. What is the volume of the cylinder so formed?

Answer 1

When a rectangular piece of paper is rolled along its width to form a cylinder so the circumference of the bas of the cylinder will be = 30 cm
And height=77cm

Circumference of circle= 2*pi*r
=2*22/7*r=30
r = (30*7)/(22*2)
r = 210/44

Volume of a cylinder = pi * r^2 *h
=(22/7)*(210/44)^2 *77
=74705400/616
=121275 cm^3

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