2019 · Q69
A right circular cone has a height 8 cm. If the radius of its base is 6 cm, then what is its total surface area?
Elementary MathematicsMensuration
- A96π cm²
- B69π cm²
- C54π cm²
- D48π cm²
Explanation
The slant height is l = √(r² + h²) = √(36 + 64) = 10 cm. Total surface area = πr(r + l) = π·6·16 = 96π cm². The answer is (A).