In mathematics, analytic geometry (also called Cartesian geometry) describes every point in three-dimensional space using three coordinates. Three coordinate axes are given, each perpendicular to the other two at the origin, the point at which they cross. They are usually labelled x, y, and z. 3D geometry involves the mathematics of shapes in 3D space and involving three coordinates which are x-coordinate, y-coordinate and z-coordinate. In a 3d space, three parameters are required to find the exact location of a point. In 3 dimensional geometry, a coordinate system refers to the process of identifying the position or location of a point in the coordinate plane.