Depending on the shape of the 3D object, you need additional dimensions like diameter or width and height besides the length, in order to calculate the volume.
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You can't tell the dimensions of a rectangle from its area, or the dimensions of a prism from its volume.
Volume = length X width X height. Therefore, take the cube root of the volume to find all the dimensions
you look at the shape
You multiply all three dimensions. This only applies for prisms. For example, for a prism with sides 3, 5, and 9, you multiply the dimensions (3*5*9) = 135 units cubed.