Question

How much metal sheet will be required to make a closed cylinder of height 1 m and diameter 140 cm?​

Answer 1

Metal sheet required to make a closed cylinder

$= 2\pi \: rh + 2\pi \: r {}^{2}$

=2×22/7×140/2×1/100+2×22/7×140/2×140/2

=31,108 cm3

hope it helps!!

Answer 2

Metal sheet required to make a closed cylinder

=(2πrh+2πr^2)

=(2×22/7×140/2×1/100+2×22/7×140/2×140/2)

=31,108 cm3.

[value of 'π'= 22/7]