Mathematics for IGCSE & O level - Mensuration (Section 9 - No. 5)
A cone has slant height 10 cm and curved surface area 65 cm². Calculate the total surface area of the cone.
110.3 cm²
95.2 cm²
87.9 cm²
76.4 cm²
説明
Curved surface area = πrs = 65 cm². CSA = πrs. π * r * 10 = 65. r = 2.06 Total Surface Area = πrs + πr²= 65 + π(2.06)² = 78.3 cm²