Question

if the radius of base of a cylinder is double and the Height remains unchanged then its curved surface area is?
a) double
b)three times
c)4 times
d)no change
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Answer 1

Let the original radius be r and height be h

Then the curved surface area of the cylinder is 2πrh

When the radius is doubled with height remaining unchanged, the new curved surface area will be 2π(2r)h = 4πrh.

Therefore option c) 4 times us the right answer

Hope it helps!

Answer 2

Answer:

double

Step-by-step explanation:

r=2r

h=h

CSA of cylinder= 2pieRH

= 2PIE(2r)h

= 4pie rh