Basic Geometric Concepts

Point: Although a chalk end is said to be the trace left on the board or on the page, the point recipe is abstract.

Correct: The end of the end is the cluster of points.

RAY: The starting point is fixed, unilaterally infinity, when a hand of a hand is burned, it can be symbolized as the shine of a center.

plane: 2 -dimensional (width), which we can define as a surface, is again symbolized by a parallel edge, but it is the concept of surface that does not have the edge, ie forever expanding forever.

Coordinate System: One is a vertical, one horizontal number line at the point 0 (original). It is called.