The base of a cone and a cylinder have the same radius 6

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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

1. 8 : 5
2. 8 : 3
3. 4 : 3
4. 5 : 3

Correct Option: A

Slant height of cone l = √6² + 8²
= √36 + 64 = √100 = 10 cm
∴ Curved surface of cylinder : Curved surface of cone = 2πrh : πrl
= 2h : l = 16 : 10 = 8 : 5