Mathematics for IGCSE & O level - Mensuration (Section 12 - No. 22)
A solid cone has a base radius of 6.5cm and a height of 6.3cm. Calculate its total surface area.
336.1 cm²
268.7 cm²
280.3 cm²
266.4 cm²
설명
Slant height = √ (r² + h²) = √ (6.5² + 6.3²) = 9.05cm; Area of base = πr² = 132.7cm²; Curved surface area = π * radius * slant height = 184.7cm²; Total Surface Area = 184.7 + 132.7= 317.4cm²