Q. The total surface area of a cylinder is equal to twice its curved surface area. If the radius is 7 cm, the height is:
✅ Correct Answer: (B)
7 cm
Explanation: 2πr(r+h) = 2(2πrh) ⇒ r+h = 2h ⇒ h = r = 7 cm.
Explanation by: Mr. Dubey
2πr(r+h) = 2(2πrh) ⇒ r+h = 2h ⇒ h = r = 7 cm.