Step-by-step explanation:
The volume of a cylinder is calculated if you multiply the area of the base by its height.
Think about it as if you are calculating the area of a circle, and then giving it a height. That's exactly what you need to do. The diameter of the base is 9cm and the height is 15cm.
So,
V = 1215π/4 ~= 954.25 cm^3
