Fold a box with a square of paper as follows:

First, first fold the square along the center line and diagonal respectively and then open, and then use the crease to fold into a double square.

Second, fold the front and back triangles up.

Third, flip the top of the left side to the right side, flip the bottom of the right side to the first picture on the left side, and then fold each of the top sides into the second picture below.

Fourth, fold the top corner up and then fold the part above the seam into the seam.

Fifth, fold the opposite side in the same way.

Sixth: Turn the picture around and fold the triangle from the left side of the top to the right side, then fold the excess into the seam.

Seventh, do the same on the other side and gently fold the box open.

Square, is one of the special parallelograms. That is, there is a set of neighboring sides are equal, and one angle is a right angle of the parallelogram is called a square, also known as a square quadrilateral. A square, has all the properties of a rectangle and a rhombus.

A rhombus with equal diagonals is a square. A rhombus with one corner at a right angle is a square. A rectangle whose diagonals are perpendicular to each other is a square. A set of rectangles with equal neighboring sides is a square. A set of parallelograms with equal neighboring sides and one angle at right angles is a square.

A parallelogram whose diagonals are perpendicular and equal to each other is a square. A quadrilateral whose diagonals are equal and vertically bisect each other is a square. A set of quadrilaterals with equal neighboring sides and three angles that are right angles is a square. A quadrilateral that is both a rhombus and a rectangle is a square.