The area of the base of the right circular cone is 400π and its height is 15cm. The curved surface area of the cone (in cm²) is ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 ie 500π .
r = 20, h = 15, l = 25 (Pythagoras)
C.S.A. = π r l
= π × 20 × 25
= 500π