I. Geometry
Geometry is a branch of mathematics. The science that studies the relationship between the shape, size and position of objects. In ancient Egypt, geodesy was carried out for the construction of the Nile water conservancy project, and it gradually developed into geometry. Around 300 BC, the ancient Greek mathematician Euclid wrote The Elements of Geometry. The calculation of graphic area has been recorded in Zhou Pian Shu Jing and Jiu Zhang Arithmetic in China in the five hundred years of Qin and Han Dynasties.
Liu Hui, Zu Chongzhi and Wang Xiaotong all made great contributions to geometry. /kloc-in the 7th century, Descartes studied geometric problems by algebraic methods and established analytic geometry. 18 and 19 centuries, due to the needs of engineering, mechanics and geodesy, descriptive geometry came into being. Since the 20th century, the emergence of theoretical physics, especially the theory of relativity, has promoted the development of differential geometry.
Second, the geometric figure
There are geometric figures everywhere in life, and everything we 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. Geometric graphics include plane graphics and three-dimensional graphics. Point, line, line segment, ray, triangle, quadrilateral, etc. Are all plane graphics; Cuboid, sphere and cone are all three-dimensional figures. Geometric graphics Plane graphics and three-dimensional graphics are actually the floorboard of all geometric graphics.
Third, the composition of geometric figures
Geometry consists of points, lines (including isolated lines and curves) and surfaces. The basic elements of a chart: points and lines. There are geometric figures everywhere in life, and everything we 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. The endless changes make the geometric pattern itself have endless charm.
Drawing is a basic term in technical drawing, which refers to a form of describing the geometric characteristics, shape, position and size of things with points, lines, symbols, characters and numbers. With the development of digital acquisition technology and signal processing theory, more and more pictures are stored in digital form.