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Q.

The diameters of two cones are equal. If their slant heights are in the ratio 7:8 ,  then the ratio of the curved surface areas will be

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a

5:6

b

4:5

c

7:8

d

2:3

answer is D.

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Detailed Solution

For two cones,

Diameters are equal

∴ radius are equal

r1=r2

Slant heights =l1:l2=7:8

C.S.A1:C.S.A2=πr1l1:πr2l2

=l1:l2

=7:8

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