Mathematics for IGCSE & O level - Mensuration (Section 13 - No. 45)
A cone has slant height 7cm and curved surface area 68 cm². Calculate the total surface area of the cone.
96.8 cm²
96.2 cm²
95.4 cm²
95.0 cm²
Forklaring
Curved surface area = πrl, 68 = π * r * 7, r = 3.09cm, Area of base = πr² = 30cm², Total Surface Area = 68 + 30 = 98cm²