in python, Write a function that will calculate the either the area ofa square or the volume of a cube based on the parameters passed to it. If only length and width are passed, the height should default to one using a default parameter. The function should use the same formula to calculate both quantities. The result should be returned in a tuple with the second part being the units (we will use feet to be consistent between everyone's code).

Ex: calc(2,5) would return (10, 'sq ft)

calc(2,5,3) would return (30, cu ft)