How to use rectangle, square, triangle, circle and parallelogram puzzles?

Rectangular, square, circle, triangle and parallelogram can be combined into a bird. Many things in life are made up of simple graphics. In daily life, we should be good at observation and careful understanding, grasp the characteristics of things, and at the same time divergent thinking and dare to imagine.

As long as you remember the characteristics of squares, rectangles and circular parallelograms, you can distinguish puzzles, and the known characteristics can be correctly understood and puzzles. If it is a regular figure, isosceles right triangle can be spelled into a square, right triangle can be spelled into a rectangle, ordinary triangle can be spelled into a parallelogram, and regular triangle can be spelled into a diamond.

There is a quadrilateral with four sides on the plane, and squares and rectangles are special parallelograms. There are geometric figures everywhere in life, and everything you can see is composed of basic geometric figures such as points, lines and surfaces. Geometry originated from western geodesy, which solves the relationship between points, lines and surfaces.

If it is a regular figure, an isosceles right triangle can be made into a square, and a right triangle can be made into a rectangle. If you are free to play, you can piece together some random numbers if you are creative.

Extended data:

The opposite sides of a parallelogram are parallel (by definition), so they will never intersect.

The area of a parallelogram is twice the area of a triangle formed by one of its diagonals.

The area of parallelogram is also equal to the cross product of two adjacent edge vectors.

Any line passing through the midpoint of the parallelogram divides the area in two.

Any nondegenerate affine transformation adopts parallelogram.

The rotational symmetry order of parallelogram is 2 (to 180) (if it is a square, it is 4).

If it also has two lines of reflection symmetry, it must be a diamond or a rectangle (non-right-angled rectangle).

If it has four symmetrical reflection lines, it is a square.

The perimeter of a parallelogram is 2(a+b), where a and b are the lengths of adjacent sides.

Unlike any other convex polygon, a parallelogram cannot be cut by any triangle less than twice its area.

The centers of the four squares built inside or outside the parallelogram are the vertices of the squares.

If two lines parallel to the parallelogram are parallel to the diagonal, the areas of the parallelogram formed on opposite sides of the diagonal are equal.

The diagonal of the parallelogram divides it into four triangles with equal areas.

Two groups of parallelograms with parallel opposite sides are parallelograms (definition judgment method).

A set of quadrilaterals with parallel and equal opposite sides is a parallelogram.

Two sets of quadrilaterals with equal opposite sides are parallelograms.

Two groups of quadrangles with equal diagonal angles are parallelograms (two groups of opposite sides are judged to be parallel).

Quadrilaterals whose diagonals bisect each other are parallelograms.

References:

Baidu encyclopedia-parallelogram