Euclid's Elements: Book 2, Prop 9
Mr Bradley's step by step board presentation of Book 2, Proposition 9: "If a straight line is cut into equal and unequal segments, then the sum of the squares on the unequal segments of the whole is double the sum of the square on the half and the square on the straight line between the points of section."
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Euclid’s Elements Book 2 Proposition 9
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Euclid's Elements Book 2 - Proposition 9
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