A Miraculous Proof (Ptolemy's Theorem) - Numberphile
16:37
Superhero Triangles - Numberphile
41:14
Epic Induction - Numberphile
32:54
Ptolemy’s Theorem and the Almagest: we just found the best visual proof in 2000 years
45:04
Why There's 'No' Quintic Formula (proof without Galois theory)
24:57
A Breakthrough in Graph Theory - Numberphile
26:36
Epic Circles - Numberphile
12:21
The Three Square Geometry Problem - Numberphile
22:00