The whole surface area of a right circular cone of radius 15 metres and height 8 metres is:
Show answer & explanation
Correct answer: B
Explanation
The crrect answer is option 2 i.e 480π m2.
Radius (r) = 15 m
Height (h) = 8 m
Slant height (l) = √(15² + 8²) = √289 = 17 m
Surface Area = π × r × (r + l)
Surface Area = π × 15 × (15 + 17) = π × 15 × 32 = 480π m²