The base edge of an oblique square pyramid is represented as x cm. If the height is 9 cm, what is the volume of the pyramid in terms of x?

The volume of any pyramid is one-third of its base area times its perpendicular height. The square base has area x² cm², so the volume is (1/3)(x²)(9) = 3x² cm³. Therefore, the correct choice is 3x² cm³.

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