The formula for the volume of a cone is
V = (1/3)π*r^2*h
Of course, the radius is half the diameter, so is 11 m. Substituting the given values, you have
V = (1/3)π(11 m)^2*(12 m)
V = 484π m^3
V ≈ 1520.5 m^3
The volume of the cone to the nearest tenth is ...
1520.5 m³