Question

A rectangular piece of paper of length 28cm and breadth 20cm rolled into a cylinder along length side. find the curved surface area of cylinder.

Answer 1

Answer:

l=28cm it will be circumference

B=20cm it will the height

$circumferenceofcircle = 2\pi \: r$

hence, 28=2×22/7×r

28×7/44=r

196/44=r

49/11=r

CSA=2pirh

=2×22/7×49/11×20

=44/7×49/11×20

=4×7×20

=28×20

= 560cm^2