Question

A cylinder has radius 2.1cm and height 9 cm . Its volume is ………​

Answer 1

Radius = 2.1cm

height = 9cm

Volume of cylinder = πr²h

= 22/7×21/10×21/10×9

= 12474/100

= 124.74 cm³

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Answer 2

$\sf\large\underline\purple{Given:-}$

$\sf\ Radius \: of \: a \: cylinder=2.1cm$

$\sf\ Height \: of \: a \: cylinder=9cm$

$\sf\ Therefore$,

$\sf\ Volume \: of \: the \: cylinder=pi×r^2×h$

✍$\sf\ frac{(22) (7) }×2.1^2×2.1^2×9$

✍$\sf\ 22×(0.3) ^2×4.41×9$

✍$\sf\ 22×0.09×4.41×9$

✍$\sf\ 78.58cm^2$