If the radius and the height of a circular cylinder are 10 cm and 15 cm, respectively, and the radius of a sphere is 5 cm, then what is the ratio of the curved surface area of the cylinder to that of the sphere?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 3:1
We have given,
The radius and the height of a circular cylinder are 10 cm and 15 cm, respectively.
The radius of a sphere is 5 cm
CSA of cylinder = 2πrh
CSA of sphere = 4πr2
CSA of cylinder : CSA of sphere = 2π × 10 × 15 : 4π × 5 × 5 = 3 : 1