Grade one math problem: make a big square with four identical right triangles and a square.
The question is not very detailed. Put the square in the middle and connect the hypotenuse of each triangle with the side of the square, and a new big square is formed, with equal and unequal sides, as long as the hypotenuse of the triangle is equal to the side of the square. Unequal sides are the sides of a new square composed of short sides and long sides.