The A4 Paper Puzzle

2016-01-11

[public] 662K views, 12.6K likes, 524 dislikes audio only

A puzzle to work out the perimeter of a shape (NO SPOILERS!) complete with an introduction to hash functions.

DO NOT put your answer tot he puzzle in the comments below. If you want to check your answer, repeatedly take the square-root five times and if the first six non-zero digits after the decimal point are 234477 (in numerical order) then you are correct.

Or check your answer using the SHA-256 hash function:

http://hash.online-convert.com/sha256-generator

Watch James on Numberphile talk about √2 and A4:

/youtube/video/5sKah3pJnHI

Watch me apologise for making fun of Imperial units:

https://www.youtube.com/watch?v=r7x-RGfd0Yk

MATT PARKER: Stand-up Mathematician

Website: http://standupmaths.com/

Music by Howard Carter

Design by Simon Wright