Arrange the cones in order from least volume to greatest volume.

a cone with a diameter of 12 units and a height of 9 units
a cone with a radius of 8 units and a height of 18 units
a cone with a radius of 5 units and a height of 13 units
a cone with a radius of 3 units and a height of 21 units
a cone with a radius of 3 units and a height of 8 units

- Cone with a radius of 3 units and a height of 8 units

- Cone with a radius of 5 units and a height of 13 units
- Cone with a diameter of 12 units and a height of 9 units
- Cone with a radius of 8 units and a height of 18 units
- Cone with a radius of 3 units and a height of 21 units

The volume of a cone is calculated using the formula V = (1/3)πr^2h, where r is the radius of the base and h is the height of the cone. So, in this case, the volume depends on both the radius and the height of the cone.