Euclid, Elements, volume 3, page 131

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[LEMMA.

If a straight line be cut into unequal parts, the squares on the unequal parts are greater than twice the rectangle contained by the unequal parts.

Let AB be a straight line, and let it be cut into unequal parts at C, and let AC be the greater; I say that the squares on AC, CB are greater than twice the rectangle AC, CB.

Euclid. Euclid's Elements. Sir Thomas Little Heath. New York. Dover. 1956.

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Euclid, Elements
Thomas L. Heath, Sir Thomas Little Heath, Ed.

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[LEMMA.

Euclid, Elements Thomas L. Heath, Sir Thomas Little Heath, Ed.

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[LEMMA.

Euclid, Elements
Thomas L. Heath, Sir Thomas Little Heath, Ed.