Mathematics for IGCSE & O level - Mensuration (Section 6 - No. 18)
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
ব্যাখ্যা
To find the slant height: √12²+5²=13. CSA=πrl. 5*13*π = 204.2cm²