A cone-shaped pile of gravel has a diameter of 30 m and a height of 9.1 m.

Which estimate best approximates the volume of the pile of gravel?

The volume of a cone-shaped figure will be calculated through the equation,

A = πr²h

where A is area, r is radius, and h is the height. Substituting the known variables,

A = π (30m/2) ² (9.1 m)

A = 6432.41 m³

The volume of the pile of gravel is approximately 6432.41 m³.