1, one-dimensional coordinate system: select a coordinate as the origin of the coordinate, take a certain direction as the positive direction, and select an appropriate scale to establish the coordinate axis to form a one-dimensional coordinate system. Two-dimensional coordinate system: two number axes perpendicular to each other on the same plane and having a common origin form a plane rectangular coordinate system.
2. The two number axes are placed in the horizontal position and the vertical position respectively, and the right and upward directions are the positive directions of the two number axes respectively. The horizontal axis is called X axis, the vertical axis is called Y axis, X axis and Y axis are collectively called coordinate axes, and their common origin O is called the origin of rectangular coordinate system.
3. Three-dimensional coordinate system: The three-dimensional Cartesian coordinate system (x, y, z) is similar to the two-dimensional Cartesian coordinate system (x, y), that is, the z value is added on the basis of the x and y values. You can also use absolute coordinate values based on the origin of the current coordinate system or relative coordinate values based on the last input point.
4. Geographical coordinates: determine the latitude and longitude value of a point on the ground, which is called the geographical coordinates of the point. Geographic coordinate network consists of latitude and longitude, which are expressed in degrees, minutes and seconds.
Use of coordinates
1 and coordinates are widely used and play an important role in many fields such as mathematics, physics, engineering and geography. Through coordinates, we can accurately locate, analyze and calculate the position and motion of objects, thus solving complex problems.
2. In mathematics, coordinates are an important tool to describe points, figures and motion positions. Any point on the plane can be represented by coordinates, and the point can be transformed by algebraic method, so as to study the nature and motion of the figure.
3. In physics, coordinates are important parameters to describe the motion state of objects. Physical quantities such as speed and acceleration of an object can be calculated through coordinates, so as to study the motion law of the object. In engineering, coordinates are an important basis for measurement, design and manufacture. Through coordinates, we can accurately determine the location, shape and size of the building, so as to build and manufacture it.
4. In geography, coordinates are an important tool to describe the position of the earth's surface. The latitude and longitude of this place can be determined by coordinates, so as to study the geographical characteristics and climate change of the earth's surface.