Mathematics for IGCSE & O level - Mensuration (Section 3 - No. 10)
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
स्पष्टीकरण
Total Surface Area = Curved Surface Area + Base Area. To get Base, we need the radius. CSA = πrl. r = CSA/ πl = 65/10π = 2.06. Total Surface area = 65 + π(2.06)² ≈ 78.3. Which is closest to option 3