(a) Express the total amount of material required for the square and the rectangle in terms of r.

(b) Find the radius and height of the can that will minimize the total amount of material required.

You are asked to build an open cylindrical can (i.e. no top) that will hold 171.5 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. 21!? (a) Express the total amount of material required for the square and the rectangle in terms of r. M") = (b) Find the radius and height of the can that will minimize the total amount of material required. inches height = l:| inches radius =