Mathematics for IGCSE & O level - Mensuration (Section 6 - No. 1)
The volume of a cone is 50 cm³. If you double the radius and keep the height the same, what is the new volume?
100 cm³
150 cm³
200 cm³
250 cm³
Explication
The volume of a cone = 1/3πr²h. Doubling the radius leads to a 4-fold increase in volume. If we double the radius, the volume will be multiplied by 4; therefore, 50*4=200 cm³.