Get them at Maths Gear: http://bit.ly/mathsgear
More links & stuff in full description below ↓↓↓

Steve Mould discusses shapes and solids of constant width, including the Reuleaux triangle and the UK's 50p coin.

Brown papers: http://bit.ly/brownpapers

NUMBERPHILE
Website: http://www.numberphile.com/
Numberphile on Facebook:   / numberphile  
Numberphile tweets:   / numberphile  
Subscribe: http://bit.ly/Numberphile_Sub

Videos by Brady Haran

Patreon:   / numberphile  

Brady's videos subreddit:   / bradyharan  

Brady's latest videos across all channels: http://www.bradyharanblog.com/

Sign up for (occasional) emails: http://eepurl.com/YdjL9

Numberphile T-Shirts: https://teespring.com/stores/numberphile
Other merchandise: https://store.dftba.com/collections/n...