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## 4th grade

### Course: 4th grade > Unit 11

Lesson 3: Parallel and perpendicular# Parallel and perpendicular lines review

CCSS.Math:

Review the basics of parallel and perpendicular lines. Identify and draw parallel and perpendicular lines in some practice problems.

## What are start color #1fab54, start text, p, e, r, p, e, n, d, i, c, u, l, a, r, space, l, i, n, e, s, end text, end color #1fab54 and start color #7854ab, start text, p, a, r, a, l, l, e, l, space, l, i, n, e, s, end text, end color #7854ab?

start color #1fab54, start text, P, e, r, p, e, n, d, i, c, u, l, a, r, space, l, i, n, e, s, end text, end color #1fab54 are lines that meet at right angles.

start color #7854ab, start text, P, a, r, a, l, l, e, l, space, l, i, n, e, s, end text, end color #7854ab are always the same distance apart from each other — no matter how far they are extended, they will never meet.

*Want to learn more about parallel and perpendicular lines? Check out this video.*

## Practice set 1: Identify parallel and perpendicular lines

*Want to try more problems like this? Check out this exercise.*

## Practice set 2: Draw parallel and perpendicular lines

*Want to try more problems like this? Check out this exercise.*

## Want to join the conversation?

- Quick question how do you prove that lines are parallel? I can't seem to find that on here and i really need to know!(182 votes)
- If you draw a line through the 2 lines, it should be perpendicular to both lines.(32 votes)

- I am having trouble remember these. Anyone have any tips to help me remember?

Edit : Case Closed. But thank you Taylyn for answering my question! Everyone have a nice day.(36 votes)- Yes. In the word Parallel, the double L's are side by side, and if going on in a straight line, would never touch. So, the double L's in Parallel are, well, parallel. Use those as an example to help you remember what parallel means.(56 votes)

- Are perpendicular any kind of lines that intersect each other? I've got to know this!(22 votes)
- Yes, perpendicular lines intersect each other with 4 90-degree angles.(3 votes)

- Does a perpendicular line ALWAYS have to be 90 degrees? Just a Question(14 votes)
- Yes, a perpendicular line must always be at a 90-degree angle(26 votes)

- does perpendicular line have to be the exactly 90 degrees?(7 votes)
- It always have to be exactly at a right angle, and a right angle is always 90 degrees so yes.(2 votes)

- What happens if a Parallel line goes through a regular line so that make it perpendicular so what is that.(11 votes)
- If the parallel line goes through the line, the lines will not be parallel anymore, so they will only be perpendicular if they meet at a right angle.(7 votes)

- Why does the human brain have to know what geometry is?(8 votes)
- So it can identify shapes and measure things. It also helps make the human brain grow.

Hope this helps :D(13 votes)

- How to know if two lines are perpendicular if there are also lines that are connected and they aren't perpendicular?(5 votes)
- what is are perpendicular and parallel lines(3 votes)
- Perpendicular means they make a right angle. (A 45 degree angle) Parallel means they will go on forever and never meet.(6 votes)

- Is cereal a soup?(5 votes)