The slant height of a right circular cone is 15 m and its height is 9 m. The area of its curved surface, is:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 180π m2
Radius = √(Slant height2 - Height2)
Radius = √225 - 81 = √144 = 12m.
Curved surface area of Cone = πrl
Curved surface area of Cone = π × 12 × 15 = 180π.