Question

The radius of a cylinder is doubled whose lateral surface area is uncha
(a) 3 cm
(b) 4 cm
©
(d) Constant
height will be
(a) Halved
(b) Doubled
(c) Tripled
5. If V and C stand respectively for volume and curved surface area of a cylin
base radius r, then
c) 20 = Vr
(d) 27 = VC​

Answer 1

Answer:

Formula : lateral surface area = 2πrh

let in starting radius is R ,height is H

according to question :

new radius ,r= 2R & height = h

and lateral area is unchanged

so that , 2πRH = 2πrh,

R.H = rh

R.H = (2R) h

h = H/2