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Lesson 3: Parallel and perpendicular

# Drawing parallel line segments

Sal draws parallel line segments with given points. Created by Sal Khan.

## Want to join the conversation?

• When does a line truly end? When it goes off the paper?
• Lines never end unless they are line segments or rays, which are different from lines. Line segments end from both ends while rays continue from one end forever.
• How do you get the next Aqualine avatar? And what qualifies as mastering a math skill? Do you have to watch all the videos for it to count?
• I got mine by mastering the exercises. A skill is mastered by earning the crown on top.
• I heard that two parallel lines intercepts itselves in the infinity. Is that true? Why?
• As mentioned by Robin, if they are parallel lines then they would never intercept at any point. They share the same slope or rise/run.
• When does a line truly end? When it goes off the paper?
• It goes into infinaty and beyond
• is it fun making videos
• It depends. If you want to make a video fun, do it on something you enjoy.
• i don't get when you say like two endpoints and like zero direction.
• It means that it ends with two points,and zero direction means that it goes for infinity. Right?