436 views

9:50

Watch
- Search Videos
  
  Advanced search »
- Submit a New Video
Discuss
About
- Try clicking on the various channels to see videos posted to that channel - if you're into music you can click the Music channel to get more music sifts - go on and explore! Use the "hotness" when you have opened the channel link to get videos that have gotten a lot of votes, or use "newness" to have a look at the new sifts.
  When browsing sifts you like, have a look at the Related Posts list to see other related videos, click the tags under the video title to see more sifts tagged with the same tags or have a look at other sifts from the same user in the More Posts By list. If the sifted video is in a play list, have a look at the play list to see other interesting videos the Sift users have linked together.
  Enter the Sift Lounge to chat with online sifters about anything and everything, or read interesting posts in the Sift Talk forum.
  The Top New Videos list is always full of interesting, current videos. It is always recommended that you have a look through the Top New Videos, but also have a look at these:
  - Upcoming Unsifted Videos - active video submissions that neither are published to the front page nor archived to the submitter's personal queue
- Have you seen a really funny, surprising, scary, interesting, cute or in any other way extra good quality video?
  Post and share it here - VideoSift is the best video aggregator on the Web, where we share, discuss, promote, and interact with the best videos out there on the web. Post it here, and share it with the large community of video-interested users. And - you are guaranteed to find more very good videos here already!
  Mind you, we only share videos you discover that someone else has made; if you "self link," by posting a video you have made, have posted or have interests in, you risk the ban hammer - read the posting guidelines before posting. The sift is NOT for promoting your own videos - it is for sharing videos others have made.
  Submit a Video Now »
Login

A4: the most rational/irrational ratio-sized paper size

submitted by pierrekrahn

9 years 10 months 2 weeks ago

An explanation as to how the A4 paper got its measurements.

It's a rational reason based on an irrational number.

4 Comments

MilkmanDan says...

Interesting, but I think it needed to touch on the idea that A0 is not 1 square meter in the sense of 1m x 1m, but rather it has an area of 1m squared with the A aspect ratio of 1 / sqrt(2).

The graphic doodles animating during the talk show A0 as 1m x 1m, which would blow the whole aspect ratio quality right out of the water.

--EDIT-- Did a wikipedia search and came up with a handy chart HERE.

Could have been half as long - He had a good start, then just started to ramble...

This post has been removed from the Education channel by channel owner Sagemind. Please review the FAQ to learn about appropriate channel assignments.

What the Fahrenheit? has been added as a related post - related requested by ChaosEngine on that post.

Discuss...

🗨️ Emojis & HTML

Enable JavaScript to submit a comment.

This website uses cookies.

This website uses cookies to improve user experience. By using this website you consent to all cookies in accordance with our Privacy Policy.