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To find the volume of the piece of cheese, we need to first find the volume of the rectangular pyramid.
The formula for the volume of a rectangular pyramid is:
V = (1/3) * base area * height
First, let's find the base area of the rectangular pyramid:
Base area = length * width
Base area = 9 cm * 4 cm
Base area = 36 cm²
Now, we can plug the values into the volume formula:
V = (1/3) * 36 cm² * 21 cm
V = (1/3) * 756 cm³
V = 252 cm³
Therefore, the volume of the piece of cheese is 252 cm³.