Lines, Line Segments, Rays, and Infinity!

🔓 This is an unlocked sample! Byrdseed.TV is open for new memberships through January 31st, 2021. Join today!

A lesson about lines, line segments, and rays that avoids dull memorization. Instead, we ponder this delightful question: Which is longer, a ray or a line? Then, kids consider what these different geometric concepts would think about each other.


In this video, students learn about the difference between lines, line segments, and rays. We differentiate by highlighting these interesting aspects of infinity and lines:

  • A ray and a line are both infinitely long, so they're both equally long, even though rays have an endpoint!
  • Line segments, lines, and rays all have the same number of points (infinity), even though line segments have a clear end and lines are infinitely long


  1. I introduce students to lines, line segments, and rays. Finally, I pose the delicious question: "Which is the longest?"
  2. Now we ponder: "Which has more points on it?"
  3. Finally, students explore an idea such as: "What would a ray think about a line?" or "If a line wrote a poem to a line segment, what would it be like?" They can then create a mini-story, a comic, a play, or whatever you see fit!

The registration window closes on January 31st, 2021

Send me some samples!

Or are you already ready to sign up?

Teachers love Byrdseed.TV!

"I LOVE these videos. It's like having two teachers in my classroom."  ~  Kristi in Ohio

"I love Byrdseed TV! I use it as a resource and inspiration source! Thank you so much for sharing your ideas and knowledge."  ~  Kari in Texas

"I absolutely LOVE all of the ideas on your site. I am using Byrdseed TV to differentiate activities for my clustered students to work on when the rest of the class is doing something they’ve already mastered."  ~  Wendy in Washington

Keep Watching

Geometry →