Question

if the radius of cylinder is doubled and height remain same what Will be its volume

Answer 1

 if the radius is doubled,it is =2r
then volume= pi r square h
                    =pi (2r)square h
                    = pi 4r square h

Answer 2

let the h be x
and r be 2x
$volume \: = \pi \: r {2} \: h$
so
v = 22/7 × (2 x ) × ( 2x) × x
v = 22/7 × 4x cube
then,
v= 88x cube / 7




hope it's helpful..
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