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1.	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» Let radius of each cone = r Ratio between their slant heights = 5:4 Let slant height of the first cone = 5x and slant height of second cone = 4x Therefore, curved surface area of the first cone = πrℓ = πr × (5x) = 5πrx curved surface area of the second cone = πrℓ = πr × (4x) = 4πrx Hence, ratio between them = 5πrx : 4πrx = 5 : 4

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»

Let radius of each cone = r

Ratio between their slant heights = 5:4

Let slant height of the first cone = 5x

and slant height of second cone = 4x

Therefore, curved surface area of the first cone =

πrℓ = πr × (5x) = 5πrx

curved surface area of the second cone = πrℓ = πr × (4x) = 4πrx

Hence, ratio between them = 5πrx : 4πrx = 5 : 4

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