Parallelogram is a closed figure composed of two groups of parallel lines on the same two-dimensional plane. Parallelogram is generally named by the graphic name followed by four vertices. Note: When using letters to represent quadrangles, be sure to indicate whether the vertices are clockwise or counterclockwise.

In Euclidean geometry, a parallelogram is a simple (not a parallelepiped) with two pairs of parallel sides.

Definition:

Two groups of parallelograms with parallel opposite sides are called parallelograms.

1, parallelogram is a plane figure.

2. Parallelogram belongs to quadrilateral.

3. The parallelogram belongs to the central symmetry figure.

What is a trapezoid:

A trapezoid is a quadrilateral with only a set of parallel opposite sides. Parallel sides are called trapezoidal bottoms: the longer bottoms are called bottoms, and the shorter bottoms are called bottoms; The other two sides are called waist; The vertical section sandwiched between the two base sides is called the height of the trapezoid.

A trapezoid whose waist is perpendicular to the bottom is called a right-angled trapezoid. An isosceles trapezoid is called an isosceles trapezoid.

What is a mind map:

Mind mapping, also known as mind mapping, is an effective graphic thinking tool to express divergent thinking. It is simple, effective and efficient, and it is a practical thinking tool.

Mind mapping uses the skills of paying equal attention to graphics and texts, showing the relationship between topics at all levels with hierarchical diagrams of mutual subordination and correlation, and establishing memory links between topic keywords, images and colors.

Mind mapping makes full use of the functions of the left and right brain and the laws of memory, reading and thinking to help people develop in a balanced way between science and art, logic and imagination, thus opening up the infinite potential of the human brain. Therefore, mind mapping has a powerful function of human thinking.

Mind mapping is a visual way of thinking. We know that radioactive thinking is the natural way of thinking of the human brain, and every kind of data will enter the brain.

Whether it is feeling, memory or idea-including words, numbers, symbols, aroma, food, lines, colors, images, rhythms, notes and so on. -it can be a thinking center, from which thousands of joints radiate outward.

Each joint represents a connection with the central theme, and each connection can become another central theme, and then thousands of joint points radiate outward, showing a radioactive three-dimensional structure.

And the connection of these joints can be regarded as your memory, just like neurons in the brain, which is your personal database.