5,263,007 views
8 years ago
466,264 views
2 years ago
59,105 views
6 years ago
427,563 views
Show more
604,136 views
12,364
0
Numberphile
4.49M subscribers
Tags
shapes
solids
geometry
tetrahedron
Reuleaux triangle
50p
fifty pence
heptagon
640 Comments