1, geometric figures are widely used in real life. For example, the design of buildings requires knowledge of geometric figures, such as rectangles, squares and triangles. To determine the shape and size of the building. In addition, geometric figures are also widely used in computer graphics, physics, engineering and other fields.
2. In geometry, it is very important to study the properties and relationships of geometric figures. For example, the length of line segment, the size of angle, the area and volume of figure are all important contents of geometry research. In addition, geometry also studies the symmetry, similarity and trajectory of figures, which is of great significance to understand the nature and laws of geometric figures.
Geometric category
1, point: the point is the most basic element in geometry, it has no size, only position. Points are often used in geometry to represent the position of an object or the vertex of a graph. Line: A line is made up of countless points. It has a starting point and an ending point, but it has no width and thickness. In geometry, lines can be divided into straight lines, rays, line segments and so on.
2. Face: Face is made up of countless lines. It has a boundary, but no thickness. In geometry, faces can be divided into planes and surfaces. Body: The body consists of countless faces, with boundaries, vertices and volumes. In geometry, solids can be divided into cuboids, cubes and spheres.
3. Classification by dimension: Geometric figures can be divided into one-dimensional, two-dimensional and three-dimensional figures. One-dimensional graphics are line segments, two-dimensional graphics are plane graphics, such as circles and triangles, and three-dimensional graphics are three-dimensional graphics, such as cuboids and spheres.
4. Classification by shape: Geometric figures can be divided into regular figures and irregular figures. Regular figures refer to figures with definite shapes and sizes, such as squares and circles, while irregular figures have no definite shapes and sizes, such as randomly generated point sets and randomly generated line segments.
5. Classification according to symmetry: Geometric figures can be divided into symmetric figures and asymmetric figures. Symmetric graphics refer to graphics that can overlap the original graphics after rotating along an axis or a straight line for a certain angle, such as squares and circles, while asymmetric graphics do not have this property.
6. Classification according to special properties: Geometric figures can also be classified according to their special properties, such as equilateral triangles and isosceles triangles. These special properties include the length of the side, the size of the angle, the symmetry of the figure and so on.