A point names an exact location in space. It has no length, width, or thickness.
Think of a point as a dot that shows a position. It is the building block of geometry.
A line is a straight path that goes on forever in both directions. It has no endpoints.
A line always extends in both directions without ending. You cannot measure its length.
A line segment is part of a line. It has two endpoints and a fixed length.
Remember: a line segment has a beginning and an end. It does not go on forever.
A ray is part of a line. It has one endpoint and extends forever in one direction.
A ray always begins at a point and goes on without end in one direction.
An angle is formed when two rays share the same endpoint, called the vertex.
Angles can be described as right, acute, or obtuse depending on their size. Always name the angle using three points with the vertex in the middle.