Mathematics for IGCSE & O level - Mensuration (Section 9 - No. 19)
A solid cone has a base radius of 3.5 cm and a height of 6.3 cm. What is the formula for calculating its total surface area?
πr² + πrl
2πr² + 2πrh
πr²h
πr²
คำอธิบาย
The total surface area of a cone is calculated by adding the area of the base (πr²) and the curved surface area (πrl), giving the formula: πr² + πrl.