1, how many line segments are there in the picture below?
2. Number of bus sections = number of terminals × (number of terminals-1)÷2.
3. How many rectangles are there in the picture below? Count the number of long hair styles skillfully.
The specific introduction of graphics:
Graphics refer to many spatial shapes that can be divided by contours in two-dimensional space. Graphics are a part of space and have no spatial extensibility. They are limited and recognizable shapes. Graphics refer to vector graphics composed of external contours. That is, straight lines, circles, rectangles, curves, charts and so on drawn by computers.
A graph uses a set of instructions to describe the content of the graph, such as describing the position dimension and shape of various primitives that make up the graph. The description object can be scaled at will without distortion. On the display side, graphics use special software to convert instructions describing graphics into shapes and colors on the screen. It is suitable for describing objects with complex contours and rich colors.
Such as: geometry, engineering drawing, CAD, 3D modeling software, etc. Its editors usually use Draw program to generate vector graphics, which can independently transform vector graphics and move, scale, rotate, twist and other primitives. The main parameters are instructions and parameters that describe the position, size and shape of primitives.
Specific introduction of geometry:
Geometry is the study of spatial structure and properties. It is one of the most basic research contents in mathematics, which has the same important position as analysis and algebra, and has a very close relationship. Geometry has a long history and rich contents. It is closely related to algebra, analysis and number theory.
Geometric thought is the most important thought in mathematics. The temporary development of each branch of mathematics tends to geometry, that is, to explore various mathematical theories with geometric viewpoints and thinking methods. Common theorems are Pythagorean Theorem, euler theorem Theorem and Stewart Theorem.
The word geometry comes from the Greek word "γ ε ω μ ε ρ? Alpha ",by" γ? α "(land) and μ ε ρ ρ ε? ν "(measurement) is a combination of two words, which refers to the measurement of land, that is, geodesy. Later it was translated into Latin "geometria". The Chinese word "geometry" was coined by Xu Guangqi when Matteo Ricci and Xu Guangqi jointly translated The Elements of Geometry in the Ming Dynasty.