Question

Q3 In a cylinder, radius is doubled and height is halved, curved

surface area will be

(A) halved (B) doubled (C) same (D) four times​

Answer 1

Answer:

c) same

$curved \: surface \: area \: of \: cylinder \: is \: 2\pirh$

$given \: r = 2r \: h = \frac{h}{2}$

$hence \: 2\pi(2r)( \frac{h}{2} )$

$= 2\pirh$

✏️so it remains the same

Answer 2

Answer:

(C) Same

Step-by-step explanation:

Radius (r) = 2r

Height (h) = $\frac{h}{2}$

∴ CSA of Cylinder = 2πrh = 2π(2r)($\frac{h}{2}$) = 2πrh