How to make a square with a sheet of paper?
Grab one corner of your paper and fold it back until flushed with the side of paper making a triangle connected to a rectangle. Fold over the rectangle side to the triangle. Rip the paper along the crease.
Grab one corner of your paper and fold it back until flushed with the side of paper making a triangle connected to a rectangle. Fold over the rectangle side to the triangle. Rip the paper outside the crease.