Evening all.

Im getting stuck on a question that I just cant figure out.

I'll relay it below and if anyone could offer some help it would be much appreciated.

A cooling tank is to be made with a trapezoidal section as shown below. Calculate for a minimum width W, the material needed to form the bottom and folded sides.

45° \_CSA=300000mm2_/ 45°

¦<---- W --------->¦

Hope the crude drawing works but all I have is a CSA and the angles of the sides. Many thanks