Measure the Earth’s Radius! (with this one complicated trick)

Hannah’s book is out now! https://www.waterstones.com/book/ruth... https://www.amazon.co.uk/dp/1787632636/ If you have a spare 2⅔ hours you can watch Matt hand craft a protractor. Yes, I know the audio is glitchy.    • Matt made a giant protractor LIVE   More about Abu Arrayhan Muhammad ibn Ahmad al-Biruni: https://mathshistory.st-andrews.ac.uk... This video was made possible by my Patreon supporters for. Those cocktails were officially on you.   / standupmaths   CORRECTIONS None yet! Let me know if you spot any mistakes. Editing and filming by Trunkman Productions https://trunkman.co.uk Protractors by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/bo... UK book: https://mathsgear.co.uk/collections/b...