Mathematics for IGCSE & O level - Mensuration (Section 5 - No. 36)
Calculate the total surface area of a solid hemisphere with radius 7.1 cm and diameter 4.7 cm.
475 cm²
330 cm²
52 cm²
475 cm²
Explication
Surface area = 2πr² + πr²= 3πr². Therefore 3 * π * (7.1)² = 475 cm²