Question

a rectangular paper of width 22 cm is rolled along its width and a cylinder of height 20 cm is formed. find the volume of the cylinder​

Answer 1

${\purple{\bf{Hola!!}}}$

Given:-
Height=20cm
Radius=r

the width (22cm) will become the circumference of the circle of base

So circumference of circle=2πr
22=2×22/7×r
22/2=22/7r
11=22/7r
11×7/22=r
77/22=r
Radius=3.5cm

Volume of cylinder=πr²h
Volume=22/7×3.5×3.5×20
=22/2×3.5×20
=11×3.5×20
=38.5×20

${\bf{\red{Volume=770cm^3}}}$

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