Q. The ratio of the curved surface area to the total surface area of a cone with r = 8 cm and l = 12 cm is:
✅ Correct Answer: (B)
3:5
Explanation: CSA:TSA = πrl : πr(r+l) = l:(r+l) = 12:20 = 3:5.
Explanation by: Krishna Sharma
CSA:TSA = πrl : πr(r+l) = l:(r+l) = 12:20 = 3:5.