## All About Lines and Rays In Angles

In this lesson plan for mid to upper elementary levels, lines and rays in relation to angles will be taught. After learning vocabulary, students will complete a hands on activity to help them remember the new geometry terms they learned. Lesson plans for teaching lines and rays have never been more fun!

## Materials

Students will need glue, markers, popsicle sticks, pom pom balls and construction paper or poster board.

## Objectives

Students can identify lines and rays and also draw these geometric terms alone and within angles. Students can name each line, ray and angle.

## Vocabulary

A **ray** starts at one point and goes in one direction forever.

A **line** travels in two directions forever.

An **angle** has two rays that come together in a **vertex**. Angles can also be formed when two or more lines intersect each other.

A **vertex** is the point where two rays intersect.

A **point** is a dot on a geometric line or figure that is identified with a letter or number. Lines have two points to help name it.

An **endpoint** is a point on a line segment or ray that defines its stopping point. A ray has one endpoint and a line does not have any.

See visuals of all of these terms at mathleague.com.

## Terms

## Procedure

Using one hand, point to the sky. Ask students to imagine their pointed finger going on forever and ever. This is a ray. A ray starts at one point and goes on forever. Now, put your arms straight out to both sides and point. Have students imagine that your pointed fingers go on for eternity. This is a line. Next, have students make a ray with their arms again. Now, they need to go shoulder to shoulder with another student so that they form an angle. Explain that the point where their shoulders meet is called a vertex. Finally, have students cross their arms in front to make an X. Sometimes when two lines intersect each other, they make four angles.

Draw a visual representation for each vocabulary word on the board. Now, explain that each ray, line and angle have a name. Draw one endpoint at the end of the ray and one point near the arrow. Write A under the first dot and B under the second dot. Explain that this is ray AB. Now, do the same for the line. Next, draw an angle and label it XYZ. Y should label the vertex. Explain that this is angle XYZ.

## Hands on Activity

Give each student six Popsicle sticks, two pom poms and a poster board. Each student needs to make a ray, a line and two angles. The pom poms should represent the vertex. Each ray, line and angle should be named. Students should glue each geometric term to a poster board. This activity can serve as an informal assessment.

## Assessment

Have students draw a ray, line and angle. They should label each one and circle the vertex.

## Extension

Students find rays, lines and angles in everyday objects around the room. They draw a picture of each and draw an angle where the image shows an angle.

## Summary

Lesson plans for teaching lines, rays, and angles should not stop at this lesson. Revisit the concepts in daily warm-ups, homework and reviews. Take opportunities to point out angles, lines and rays in real life. Finally, continue having students draw lines, rays and angles. After all, these terms are the building blocks for more difficult concepts.

## Resources

Angles and Angle Terms, mathleague.com

## Images

Images taken from:

https://upload.wikimedia.org/wikipedia/commons/b/b1/Line.PNG

https://commons.wikimedia.org/wiki/File:Angle_vertex.JPG