Answer is 2884.875 cm^3
Step by step
Volume of cone = 1/3 TT r^2 height
We are looking for volume
We know height is 25cm
We know diameter is 21 so 1/2 of 21 is 10.5cm for radius
Fill in numbers into the formula
V = (1/3) (3.14) (10.5^2) (25)
Multiply
Answer is 2884.875 cm^3