Q.E.D. [Quod erat demonstrandum: Which was to be proved.]

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Q.E.D. [Quod erat demonstrandum: Which was to be proved.]

Elements, bk. I, proposition 5

Q.E.D. [Quod erat demonstrandum: Which was to be proved.]

Q.E.D. [Quod erat demonstrandum: Which was to be proved.]

Q.E.D. [Quod erat demonstrandum: Which was to be proved.]

Q.E.D. [Quod erat demonstrandum: Which was to be proved.]

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