The base radii of two cylinders are in the ratio 4 : 5 and their heights are in the ratio 2 : 9. The ratio of their curved surface areas is:
Answer & explanation
Correct answer: option 1
Curved surface area of cylinder = 2πrh
CSA1 : CSA2
2πrh : 2πRH
rh : RH
4 × 2 : 5 × 9
8 : 45
The correct answer is Option (1) → 8 : 45