Euclid's Elements: Book 3, Prop 3
Mr Burnham's step by step board presentation of Book 3, Proposition 3: "If in a circle a straight line through the center bisect a straight line not through the center, it also cuts it at right angles; and if it cuts it at right angles, it also bisects it."

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Euclid's Elements: Book 3, Prop 4

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Euclid's Elements: Book 3, Prop 1

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Euclid's Elements Book 3 - Proposition 2

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Euclid's Elements: Book 3, Prop 33

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Euclid's Elements Book 1 - Proposition 4

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Euclid's Elements Book 2: Proposition 4, Squaring a Sum

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How Historical Swordfight Really Looked Like

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Why Peter Scholze is once in a Generation Mathematician

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Rowan Atkinson's Brilliant Humor Leaves Celebrities in Tears!

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Euclid's Elements: Book 3, Prop 36

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