Pentagons and the Golden Ratio – Numberphile

Continuing on from Zvezda’s previous video about Ptolemey’s Theorem (see: now we use it to prove some cool stuff with pentagons and equilateral triangles.
More links & stuff in full description below ↓↓↓

Zvezda’s Numberphile playlist:

Zvezda’s webpage:

Golden Ratio:

Epic Circles:

Triangle Magic Highway:

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