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To find the volume of the wedge, we need to use the formula for the volume of a rectangular pyramid:
V = (1/3) * base area * height
First, we need to find the area of the base of the wedge:
Base area = 4 cm * 9 cm = 36 cm²
Now, we can plug these values into the formula:
V = (1/3) * 36 cm² * 21 cm
V = (1/3) * 756 cm³
V = 252 cm³
Therefore, the volume of the slice of cheese is 252 cubic centimeters.