This video features Dr Hannah Fry (more links below) ↓↓↓ Check out Brilliant.org: brilliant.org/numberphile (20% off premium subscription) That circle cutting problem on Brilliant: brilliant.org/NumberphileSandwich Hannah Fry on Twitter: twitter.com/FryRsquared Read about Hannah's Xmas book (and buy a copy to show her some support!): www.bradyharanblog.com/blog/hannahs-book More Hannah videos on Numberphile: bit.ly/hannah_vids Animation by Pete McPartlan Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): bit.ly/MSRINumberphile We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science. NUMBERPHILE Website: www.numberphile.com/ Numberphile on Facebook: www.facebook.com/numberphile Numberphile tweets: twitter.com/numberphile Subscribe: bit.ly/Numberphile_Sub Videos by Brady Haran Patreon: www.patreon.com/numberphile Brady's videos subreddit: www.reddit.com/r/BradyHaran/ Brady's latest videos across all channels: www.bradyharanblog.com/ Sign up for (occasional) emails: eepurl.com/YdjL9