I'm stuck with my homework in the following task:
a rectangular parallelepiped ( b*b*h ) holds K dm^3.
Show that the total surface area of the side faces and top and bottom surface is minimal if h/b = 1
see picture in the link: https://myalbum.com/album/k1KaEgC1WieE
I must first describe a function / formula with one variable , who can help me thus on the way?
I fail to derive it by myself.