Pyramid - A pyramid with a square base and four faces, each in the shape of an isosceles triangle, is made by cutting away four

Question

triangles from a square piece of cardboard and bending up the resulting
triangles to form the walls of the pyramid. The diagonal of the square before the triangles are cut is 24 in. The sides of this square are 12 root 2. The base is square with sides x. (a) Find the height in terms of x. (b) find the max volume and x