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?
Correct Answer: 8 : 5
Explanation:
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
