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2VdV + 2PdP + 3T2dT (this is an expression, not an equation because there is no equals sign)
pi*r*h2 is an expression. On the basis of conventions, one might assume that r is a radius, and h is a height. Since both these are measures of length, the overall expression has dimensions [L]*[L2] = [L3], that is, the dimensions of a volume. Common shapes with one measure of radius and a height are cylinders, cones, sections of a sphere but the above expression does not refer to the volume of such a shape.
45x12units cube
radical expressiona radical expression
A square has an area not a volume. Here are some equations for a cube and a square area of a square = length² volume of a cube = length³ Remember that units are very important.