Question 6
Mensuration of SolidsA cone has a height of 12cm and a base radius of 5cm. Find the total surface area
- A.283cm2
- B.204.23cm2
- C.78.77cm2
- D.142cm2
Show the answer and explanation
Answer: A (283cm2)
Explanation
Slant height l = √(12² + 5²) = 13. Total surface area = πr(l + r) = (22/7) × 5 × 18 ≈ 282.9 ≈ 283 cm².