Proof using Complex Numbers: Ptolemy's Theorem
13:08
Trig Functions of Complex Numbers
10:59
A Ridiculous Approximation
21:46
Complex Numbers Have More Uses Than You Think
12:05
Three pretty geometric theorems, proved by complex numbers
8:54
Angle Sum Formulae: Proof using Ptolemy's Theorem
29:57
Euler's Formula Beyond Complex Numbers
6:16
An Unusual Way to Prove Napoleon's Theorem
7:04