Mathematics for IGCSE & O level - Mensuration (Section 6 - No. 43)
A cone has a slant height of 13 cm and a base radius of 5 cm. What is its curved surface area?
204.2 cm²
65 cm²
78.5 cm²
157 cm²
説明
Curved Surface Area (CSA) = πrl = π * 5 cm * 13 cm ≈ 204.2 cm².