The volume of a cone is given by the formula:
V = (1/3) * pi * r^2 * h
where r is the radius of the base and h is the height of the cone.
Substituting the given values, we get:
V = (1/3) * pi * 9^2 * 23
V = (1/3) * pi * 729 * 23
V = 6,859 pi
Therefore, the volume of the cone is 6,859 pi cubic units.