Mathematics for IGCSE & O level - Mensuration (Section 1 - No. 14)
Calculate the curved surface area of a cone of base radius 5 cm and perpendicular height 12 cm
188.5 cm²
94.2 cm²
204.2 cm²
354.2 cm²
คำอธิบาย
Curved Surface area = πrl. s = √12²+5²=13. Curved Surface Area ≈ π* 5 * 13 ≈ 204.2 cm²