A cone has base area equal to its lateral surface area. If the radius of the base is 7 cm, what is the slant height?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 7 cm.
Base area = πr2 = 22/7 × 72 = 154 cm2
Lateral surface area = πrl = 22/7 × 7 × l = 154
⇒ 22l = 154
⇒ l = 154/22 = 7 cm