Mathematics for IGCSE & O level - Mensuration (Section 7 - No. 21)
A cone has a base radius of 5 cm and a perpendicular height of 12 cm. Calculate for curved surface area.
154.5 cm²
204.2 cm²
188.5 cm²
254.4 cm²
설명
Slant height(s) = √(r² + h²) = √(5² + 12²) = 13 cm. Curved Surface Area = πrs = π * 5 * 13 ≈ 204.2 cm²