The locus of point from a position in a direction on a plane is called ray.

The ray is one directional straight line. It is actually formed by a point which starts from a position on a plane and continues its traveling infinitely in a direction. It seems, it is a part of the straight line.

- $R$ is a location on a plane.
- A point is started travelling from location $R$ and continued travelling infinitely in the same direction by passing through various locations including $S$.
- The locus of the travelling point from a particular location formed a straight path in a direction and it is called a ray.

According to the way a ray is formed in geometrical system, the ray is represented in mathematical form in mathematics.

- Firstly, write the name of location where the ray is started traveling and then write name of a point through which the ray is passed to continue travelling infinitely.
- Display a right arrow symbol $(\rightarrow)$ over the names of both points which play vital role in forming the ray.

Here, $R$ is the location where the ray is started and then $S$ is another location through which the ray is passed to continue travelling infinitely. Therefore, write names of both points and then draw a right arrow above them to represent a ray in mathematics. In other words, $\overrightarrow{RS}$ is the mathematical representation of a ray.

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