A rectangle is made up of five adjacent squares. If you want to cut it into a square, the less pieces you fry, the better. How do you cut it?

A rectangle is made up of five adjacent squares. If you want to cut it into a square, the less pieces you fry, the better. How do you cut it?

Let the side length of each square be a
Cut the rectangle composed of two squares close to each other according to its diagonal, and the middle square is not cut, then four right triangles can be obtained, and the lengths of their right sides are 2a and a; close the long right side of the four right triangles to the square, and the short straight side is in a straight line with one side of the square, then a large square with side length of √ 5 can be assembled