If radius is halved and height is doubled.

In a cylinder, if radius is halved and height is doubled then the volume will be
(a) same
(b) doubled
(c) halved
(d) four times

Solution:

Let radius of cylinder = r
and height = h
then volume = πr²h
If the radius is halved and the height is doubled

In a cylinder, if the radius is doubled &nd height is halved then its curved surface area will be
(a) halved
(b) doubled
(c) same
(d) four times

Solution:

Let radius of a cylinder = r
and height = h
Then curved surface area = 2πrh
Now if radius is doubled and height is halved,
then curved surface area = 2π × 2h = 2πrh
which is same (c)

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