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Euclid: Elementa

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Click to Expand/Collapse OptionTitle
Click to Expand/Collapse OptionPreface
Click to Expand/Collapse OptionBook I
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gre I,40
ὅπερ ἔδει δεῖξαι.
Pic372
Pic651
eng
Q. E. D.]
lat Sic
Quod oportebat ostendere.
lat Gerard
Et hoc est quod demonstrare voluimus.
lat Adelard
Et hoc est quod demonstrare intendimus.
lat Hermann
No Latin
ara Uppsala
No Arabic
ara Tuṣi
وذلك ما اردناه
ara Nairizi p. 162
وذلك ما اردنا ان نبين.
san
No Sanskrit
lat Clavius
Quod erat demonstrandum.

SCHOLION
EODEM modo demonstrari poterit hoc theorema.
TRIANGVLA æqualia inter easdem parallelas, si non eandem habuerint basin, super æquales bases erunt constituta.
SINT triangula æqualia A B C, D E F, inter parallelas A D, B F, & super bases B C, E F, quas dico esse æquales. Si enim non sunt æquales, sit B C, maior. Abscissa ergo recta C G, æquali ipsi E F, & ducta recta G A; erit triangulum A G C, triangulo D E F, æquale: Ponitur autem & triangulum A B C, eidem triangulo D E F, æquale: Igitur triangula A G C, A B C, æqualia erunt, pars & totum, quod est absurdum. Non ergo inæquales sunt bases B C, E F, sed æquales. Quod est propositum.
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