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Euclid: Elementa

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eng
Then, since AC is equal to AD, the angle ACD is also equal to the angle ADC; [I. 5]
lat Clavius
Sint enim, si fieri potest, rectæ A C, A D, inter se, & rectæ B C, B D, inter se etiam æquales. Aut igitur punctum D, erit in alterutra rectarum A C, B C, ita vt recta A D, in ipsam rectam A C vel B D, in ipsam B C, cadat; aut intra triangulum A B C; aut extra. Sit primo punctum D, in altera rectarum A C, B C, nempe in A C, vt A D, sit pars ipsius A C. Quoniam igitur rectæ A C, A D, eundem terminum A, habentes dicuntur æquales, erit pars A D, toti A C, æqualis. Quod fieri non potest. Sit deinde punctum D, intra triangulum A B C, & ducta recta C D, producantur rectæ B C, B D, vsque ad E, & F. Quoniam igitur in triangulo A C D, ponuntur latera A C, A D, æqualia erunt anguli A C D, A D C, super basim C D, æquales;
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