Ray

A ray is a part of a line that has one endpoint and extends infinitely in one direction. It can be named by its endpoint and another point on the ray, or by a single lowercase letter. The two main components of a ray are the endpoint and the direction in which it extends.

Key Terms:

1. Endpoint: The fixed point at one end of the ray.
2. Infinity: The concept that the ray extends infinitely in one direction.

Notation:

A ray is typically named by its endpoint and another point on the ray, with a symbol above the two letters to indicate that it is a ray. For example, if A is the endpoint and B is another point on the ray, it can be denoted as AB.

Example:

If point A is the endpoint and point B lies on the ray, the ray can be denoted as AB.

Study Guide:

When studying rays, it's important to understand the concept of a line, as a ray is a part of a line. Familiarize yourself with the notation used to represent rays and practice naming and drawing rays based on given endpoints and directions.

Key points to remember:

• A ray has one fixed endpoint and extends infinitely in one direction.
• A ray can be named by its endpoint and another point on the ray, or by a single lowercase letter.

Practice Questions:

1. Draw a ray with endpoint A that extends through point B.
2. Name the ray with endpoint C that extends infinitely in the opposite direction of point D.

Understanding rays is essential for grasping the concept of lines and angles in geometry. Make sure to practice drawing and naming rays to solidify your understanding of this topic.