Published by:
CGP EDU Academic Team
Published on: August 14, 2026
The radius of the base of a cone is increasing at the rate of 
and the altitude is decreasing at the rate of 
. The rate of change of lateral surface area when the radius is 
and altitude is 
is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Let 
and 
be the radius, slant height and height of cone respectively, at any time 
.
Then, 
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