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This is Numberphile. We mainly post videos about mathematics and just numbers in general.

Ptolemy's Theorem

Ptolemy's Theorem

Brady Haran
Zvezdelina Stankova, Circles, Triangles

Additional information

Featuring Zvezdelina Stankova... Want more?

Part 2 (bringing in Pentagons and the Golden Ratio) is at: https://youtu.be/o3QBgkQi_HA

Zvezda's Numberphile playlist: http://bit.ly/zvezda_videos

Zvezda's webpage: https://math.berkeley.edu/~stankova/

Epic Circles: https://youtu.be/sG_6nlMZ8f4

Triangle Magic Highway: https://youtu.be/wVH4MS6v23U

Pentagons and the Golden Ratio

Pentagons and the Golden Ratio
Russian Multiplication

Russian Multiplication