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The base of a cone and a cylinder have the same radius 6 cm. They have also the same height 8 cm. The ratio of the curved surface of the cylinder to that of the cone is ?
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- 4 : 3
- 5 : 3
- 8 : 5
- 8 : 3
Correct Option: C
Ratio of curved surface area of cylinder and cone = [2πrh] / [πr√h2 + r2]
= [2 x 6 x 8] / [6 x √62 + 82]
= 96/(6 x 10) = 96/60 = 8/5 = 8 : 5
