﻿ Definition and examples ray | Define Ray - Algebra - Free Math Dictionary Online

# Ray

## Definition of Ray

A ray is a part of a line that begins at a particular point (called the endpoint) and extends endlessly in one direction. A ray is also called half-line.

### How do we name a Ray?

A ray is named based on the direction in which it extends.
A ray is named with its endpoint in the first place, followed by the direction in which its moving.
In the example shown below, P is the endpoint and Q is the point towards which the ray extends. So, the ray PQ is represented as:

Look at another example. This ray will be called QP as it starts at Q and extends towards P. So, the ray QP is represented as:

### Solved Example on Ray

#### Solution:

• Step 1: The definition of a ray states that "A ray is a part of a line that begins at a particular point (called the endpoint) and extends endlessly in one direction."
• Step 2: As per the defition of a ray, among the figures given only Figure 2 represents a ray

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