A Miraculous Proof (Ptolemy's Theorem) - Numberphile

Featuring Zvezdelina Stankova... Want more?
Part 2 (bringing in Pentagons and the Golden Ratio) is at: https://youtu.be/o3QBgkQi_HA
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Видео A Miraculous Proof (Ptolemy's Theorem) - Numberphile канала Numberphile