You are asked to build an open cylindrical can (i.e. no top) that will hold $665.5$ cubic inches. To do this, you will cut its bottom from a square of metal and form its curved side by bending a rectangular sheet of metal.
(a) Express the total amount of material required for the square and the rectangle in terms of $r$.
I just need a hind nothing more, do I have to add the area of the rectangle with the area of the square?