Q. The total surface area of a cone is 330 cm² and its radius is 7 cm. Using π = 22/7, the slant height is:
✅ Correct Answer: (B)
8 cm
Explanation: 330 = (22/7)×7×(7+l) = 22(7+l). Hence l = 8 cm.
Explanation by: Krishna Sharma
330 = (22/7)×7×(7+l) = 22(7+l). Hence l = 8 cm.