Q. The ratio of the total surface areas of two cylinders having equal heights is 4 : 9. The ratio of their radii is:
✅ Correct Answer: (A)
2 : 3
Explanation: With equal heights, TSA is proportional to radius when height is fixed. Hence radius ratio = 2 : 3.
Explanation by: Mr. Dubey
With equal heights, TSA is proportional to radius when height is fixed. Hence radius ratio = 2 : 3.