This discussion board is a place to discuss our Daily Challenges and the math and science
related to those challenges. Explanations are more than just a solution — they should
explain the steps and thinking strategies that you used to obtain the solution. Comments
should further the discussion of math and science.

When posting on Brilliant:

Use the emojis to react to an explanation, whether you're congratulating a job well done , or just really confused .

Ask specific questions about the challenge or the steps in somebody's explanation. Well-posed questions can add a lot to the discussion, but posting "I don't understand!" doesn't help anyone.

Try to contribute something new to the discussion, whether it is an extension, generalization or other idea related to the challenge.

Stay on topic — we're all here to learn more about math and science, not to hear about your favorite get-rich-quick scheme or current world events.

Markdown

Appears as

*italics* or _italics_

italics

**bold** or __bold__

bold

- bulleted - list

bulleted

list

1. numbered 2. list

numbered

list

Note: you must add a full line of space before and after lists for them to show up correctly

It is not necessary that parallel lines must be straight, they are the line which maintain equal distance between them.
Now, think of a situation where parallel lines are moving on a triangle/circle then they will definitely meet each other at some point.

My friend told me that one example are the longitudes. :) When we are in our elementary years, they are defined as vertical imaginary lines. Next thing we know is where they meet ;)

Well, parallel lines are considered to meet at infinity. So, if you can reach infinity, which I presume is not much easy a job, you watch them meet. :)

Easy Math Editor

This discussion board is a place to discuss our Daily Challenges and the math and science related to those challenges. Explanations are more than just a solution — they should explain the steps and thinking strategies that you used to obtain the solution. Comments should further the discussion of math and science.

When posting on Brilliant:

`*italics*`

or`_italics_`

italics`**bold**`

or`__bold__`

boldNote: you must add a full line of space before and after lists for them to show up correctlyparagraph 1

paragraph 2

`[example link](https://brilliant.org)`

`> This is a quote`

Remember to wrap math in`\(`

...`\)`

or`\[`

...`\]`

to ensure proper formatting.`2 \times 3`

`2^{34}`

`a_{i-1}`

`\frac{2}{3}`

`\sqrt{2}`

`\sum_{i=1}^3`

`\sin \theta`

`\boxed{123}`

## Comments

Sort by:

TopNewestOne concrete example for this can be the horizon, where the land and sky appear to meet. But they never meet until infinity.

Log in to reply

Good example. Mine is related to this :)

Log in to reply

It is not necessary that parallel lines must be straight, they are the line which maintain equal distance between them. Now, think of a situation where parallel lines are moving on a triangle/circle then they will definitely meet each other at some point.

Log in to reply

My friend told me that one example are the longitudes. :) When we are in our elementary years, they are defined as vertical imaginary lines. Next thing we know is where they meet ;)

Log in to reply

Well, parallel lines are considered to meet at infinity. So, if you can reach infinity, which I presume is not much easy a job, you watch them meet. :)

Log in to reply

Yes, that is true. However, can you think of a concrete example which can prove the intersection of parallel lines? :)

Log in to reply

Sky and land...

Log in to reply

I think A railway track is like a parallel line but they will intersect at various place generally naerer to station

Log in to reply

definition of parallel lines says that parallel lines are straight lines.so there is no probabilities that they would meet somewhere.

Log in to reply

. It is impossible that parallel lines will be meet ,because of their equal slopes.Lines will intersect ,if they are unequal slope.

Log in to reply

Parallel lines are meet at infinite. :-) ... Proof -: when we see sky and land, it seems to be meet each other at infinite

Log in to reply