The diameter of two cones are equal.

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asked Mar 15 in Class X Maths by navnit40 (-3,330 points)

The diameter  of two cones are equal. If their slant heights be in the ratio of  5 : 4. Find the ratio of their curved surface  areas ?

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1 Answer

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answered Mar 15 by navnit40 (-3,330 points)

Let their slant height be 5x and 4x.

Given that diameter of two cones are equal

∴  R1 = R2 = R

S1 = πRl  = πR(5x)

S2 = πRl  = πR(4x)

S1/S2 = πR(5x)/ πR(4x)  = 5/4

S1/S2 = 5/4

S1 : S2 = 5 : 4

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