Golden Ratio is Irrational from a Regular Pentagon (visual proof)
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Root Two is Irrational Visually
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Pentagons and the Golden Ratio - Numberphile
7:25
A New Ice Age For Europe Is Becoming More Likely
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Root 2 is Irrational from Isosceles Triangle (visual proof)
20:58
A Dozen Proofs: Sum of Integers Formula (visual proofs) #SoME2
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How to draw a Golden Ratio Spiral
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The Secret Formula: Using Grids and the Golden Ratio for Perfect Logos
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