## ray

### In mathematics, a ray refers to a part of a line that starts from a fixed point and extends infinitely in one direction

In mathematics, a ray refers to a part of a line that starts from a fixed point and extends infinitely in one direction. It can be thought of as a part of a line with one endpoint, known as the starting point or origin, and the other end extending indefinitely.

To denote a ray, we typically use a single letter and place a small arrowhead on top, pointing in the direction of its extension. For example, if we have a ray starting from point A and extending to the right, we can represent it as “ray AB” or simply as “ray A” with an arrowhead pointing to the right.

Rays are named by using the letter or symbol of the origin point or any other identifiable point of the ray within the line. However, it is crucial to note that the letter used to represent the ray does not necessarily need to be the first letter of the origin point; it can be any letter.

The concept of a ray is important in geometry as it helps describe angles, determine intersections, and form shapes. By studying rays, mathematicians can understand the behavior of light, interpret reflections, and analyze the movement of objects in space.

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