Mathematics for IGCSE & O level - Mensuration (Section 7 - No. 8)
The volume of a cone is 50 cm³. If you triple the radius and keep the height the same, what is the new volume?
150 cm³
450 cm³
300 cm³
400 cm³
解释
Volume of a cone = 1/3πr²h. Tripling the radius leads to a 9-fold increase in volume. Therefore, 50*9 = 450 cm³