Cow-culus and Elegant Geometry - Numberphile
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The Nescafé Equation (43 coffee beans) - Numberphile
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A Miraculous Proof (Ptolemy's Theorem) - Numberphile
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Why 4d geometry makes me sad
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A Fascination with Fractured Friezes - Numberphile
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Thales's Theorem
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Why is there no equation for the perimeter of an ellipse‽
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exact value of sin(3 degrees)
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