Euclid's Elements: Book 3, Prop 35
Mr Burnham's step by step board presentation of Book 3, Proposition 35: "If in a circle two straight lines cut one another, then the rectangle contained by the segments of the one equals the rectangle contained by the segments of the other."

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Euclid's Elements: Book 3, Prop 35

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Euclid's Elements Book 3 - Proposition 35

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