Go check out the puzzles over on Brilliant!
brilliant.org/standupmaths

Use the URL above to help support this video and get 20% off the paid premium versions.

Once you’ve done that: help us calculate the thickness of a three-sided coin!

The bonus video explains how you can get involved. We expanded the audience participation aspect loads after we filmed the main video; which is why a whole second video was required.
youtu.be/xN5_VO7Nbu8

All the links for the various resources are over here.
think-maths.co.uk/threesidedcoin

Here is the form to sign-up and ask nicely to borrow Hugh’s coins.
bit.ly/coinrequest

Buy or print your own cylindrical coins.
www.shapeways.com/shops/mathgrrl?section=Education