Surface area of sphere in n dimensions
17:18
Arithmetic geometric mean inequality
32:30
Volume of a ball in n dimensions
13:47
How to derive the volume of an n-dimensional hypersphere (the long version)
15:51
Mas por que a área da superfície de uma esfera é quatro vezes maior que a sua sombra?
9:10
Derivative of Volume = Surface Area (In Any Dimension? Even Fractional Dimensions?)
23:21
Derivative of volume is surface area
33:31
The Weak Derivative
16:31