A point shows location and has no size or dimension. A point is represented by a dot and is usually named with a letter of choice.

Well, your 2nd or 3rd grader just might challenge your definition. Lines, line segments, and rays are all second and third grade math conceptsand although they are similar, they are not the same. What exactly do these geometry terms mean?

Read on to find out. A line is defined as an infinite set of points forming a straight path, extending in both directions. It does not have a beginning or an end. A line segment is a part of a line, defined by two endpoints.

A ray is a part of line that has only one endpoint, and extends indefinitely in one direction. You may have noticed that a line has arrows on both ends.

This is to indicate that the line goes on forever in both directions. There are 2 points on the line that are labelled with uppercase letters. A line segment has an endpoint on both ends, indicating that there is a distinct beginning and end.

Each endpoint is labelled with an uppercase letter. A ray has one endpoint, and an arrow on the other end. It too is labelled with uppercase letters on each end.

Intersecting lines are lines that cross one another.

Parallel lines are two lines that are equal distance from one another if the two lines were extended infinitely, they would never cross. Your child will likely be asked to draw lines, line segments and rays at school.

A typical question would look like this: Your child would draw: The drawing should form a cross shape. What To Watch For As your child is naming lines and line segments, be sure he notices that they can be read in either direction.

A ray must be read in the direction of the arrow. This is one of the most common mistakes students make. As always, playing math games at home is a great way to reinforce math skills learned in school.

Have questions or ideas about this story? Have ideas for future Parent Homework Help stories?A ray has no measurable length, because it goes on forever in one direction.

Drawing a ray You can draw a ray as a line that just goes off the edge of the page, as in the figure above. A ray is a part of a line that has one endpoint and goes on infinitely in only one direction. You cannot measure the length of a ray. You cannot measure the length of a ray.

A ray is named using its endpoint first, and then any other point on the ray (for example, B A →). 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. Deb Russell is a math educator at the primary and secondary school levels.

She has written on mathematics for over 14 years. A ray is the part of the line which consists of the given point and the set of all points on one side of the endpoint. In the image labeled Ray, A is the endpoint and this ray.

Third Grade Math: How to Name Line Segments. You can also write the names of these line segments in reverse order, so the first one would be BA, the second CB, and so on.

The order in which you name the points is up to you. Ray A ray is very similar to a line. Recognize rays, lines, and line segments in geometric figures.

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Geometric Terms - Free Math Help