Answer:
The formula for the volume of a cone is V = (1/3)πr^2h,
r is the base radius
h is the height.
Substituting the given values, we get:
V = (1/3)π(4 yards)^2(9 yards)
V = (1/3)π(16 yards^2)(9 yards)
V = (1/3)π(144 yards^3)
V = 48π cubic yards
Therefore, the volume of the cone is 48π cubic yards.