Question

The diameter of two cones are equal. If their slant heights are in the ratio 5 : 4, find the ratio of their curved surface areas.​

Answer 1

$\pi rl \: = \pi rl$

$\frac{\pi \: rl}{\pi \: rl}$

rl/rl. (both diameter are equal)

5r/4r

5/4

5:4

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Answer 2

radius of both come is r then
one of cone height is 5x and another is 4 x
CSA OF BOTH CUBE
1 .CASE

$\pi \: rsqure \: l \:$
22/7 × r (square) 5x : 22/7 × r(square) × 4x
remove r and pi from both side
5x:4x
this is ratio of CSA OF BOTH CONES