How to find areas on a sphere: Girard's theorem
5:14
What is "mean" about the mean curvature?
16:17
The Revolutionary Genius Of Joseph Fourier
7:51
Spherical Geometry: Deriving The Formula For The Area Of A Spherical Triangle
7:51
So Why Do We Treat It That Way?
23:06
Math News: The Fish Bone Conjecture has been deboned!!
12:05
Three pretty geometric theorems, proved by complex numbers
12:56
Explicit calculation: why random walk is recurrent for 2D, but not 3D
23:37