# Points, Lines, Line Segments, & Rays

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Points, Lines, Line Segments, & Rays
CCSS.MATH.CONTENT.4.G.A.1

## Information about the videoPoints, Lines, Line Segments, & Rays

### Contents

#### In This Points, Line segments, Lines and Rays Video

Nico and Nia are trying out for the Geocity Giants. Before they take their turn at bat, the Coach needs to show them the fundamentals of geometry. In this video, we learn how points, lines, rays, and line segments, are used in everyday life and we will identify points, lines, line segments, and rays on a baseball field. Will Nico and Nia make the team?

#### What are Points?

Points are specific locations on a flat surface.

#### What are Lines?

Lines are a set of points that extend indefinitely, or without end, in both directions.

#### What are Line Segments?

Line segments are parts of a line between two endpoints.

#### What are Rays?

Rays are a part of a line that has an endpoint on one side but extends in the opposite direction without ending.

#### Additional Practice with Points, Lines, Line Segments, and Rays

Following the video, there are points, line segments, lines, and rays activities.You can continue practice with points, lines, line segments, and rays worksheets including a points, line segments, lines, and rays worksheet answer key.

### TranscriptPoints, Lines, Line Segments, & Rays

Nico and Nia are trying out for the Geo City Giants. [Coach:] “Today, we hope to have some new members join our team.” [Coach:] “FIRST, We are going to go over some of the fundamentals so LISTEN UP!” Before Nico and Nia can try out for the team, Coach needs to explain, Points, Lines, Line Segments, and Rays. Geometry is the study of shapes, sizes, angles, and dimensions of objects. In order to understand geometry, we need to learn the fundamentals. All geometry is based on these beginning concepts: A POINT is a specific location on a flat surface. A LINE is a set of points that extends indefinitely, or without ending, in BOTH directions. We often show this by putting an arrow at each end of the lines that we draw. A LINE SEGMENT is part of a line between two endpoints. A RAY is part of a line that has an endpoint on one side but extends in the other direction without ending. Using the baseball field as our example, let’s see how these concepts, or ideas, work in everyday life. Points are created by marking specific locations on a flat surface. What points do you see on the baseball diamond? The bases make points, home plate is a point, and the pitcher’s mound is also a point on the field. We can even create more points on the field when we put the players in their positions.

A line is created by connecting a set of points. Look at the foul lines. We say that lines are indefinite, or never-ending because they have the ABILITY to continue forever(...) in both directions. We are only seeing a portion of the line. This end could keep on going, indefinitely, in this direction. When we look at only a section of a line, we call it a LINE SEGMENT. We mark the section of the line with endpoints, to indicate we are only looking at this part. In baseball, there are many line segments. The paths between the points made by the bases are line segments, and from the pitcher’s mound to home plate is a line segment. Even when the third baseman, throws to the first baseman, a line segment is made. Do you see more line segments on the field? Yes, line segments can be anywhere depending on the position, or points, of the players. In baseball, a ray can be created when a player is at-bat. Homeplate is the position of the endpoint… and the lines would extend outward like this. Baseball is one example of how we use geometry in everyday life. While Nico steps up to the plate, let's review. Remember… All geometry is based on these beginning concepts: A POINT is a specific location on a flat surface. A LINE is a set of points that extends indefinitely in BOTH directions. A LINE SEGMENT is part of a line between two endpoints. A RAY is part of a line that has an endpoint on one side but extends in the other direction without ending. "[Coach:] “NICO, you’re up, “Let’s see what ya got!”