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Euclid: Elementa

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gre XΙ,38
λη῾
Pic2898
eng
PROPOSITION 38.
lat Sic
(Vulgo XI.38)
Si planum ad planum rectum sit et a quolibet puncto existentium in uno planorum ad alium planum cathetus ducatur, ad communem sectionem planorum cadet ductus cathetus.
Planum enim GD plano AB ad rectos sit, communis itaque eorum sectio sit DA, et sumatur ad GD planum accidens punctus E. Dico quoniam ab E ad AB planum cathetus ductus ad DA cadet.
Non enim, sed si possibile, cadat extra sicut EZ et copuletur in AB plano secundum Z punctum et AZ ad DA in AB plano cathetus elevatus ducatur ZI que et GD plano ad rectos est, et copuletur EI. Quoniam autem ZI, GD plano ad rectos est et tanget eam EI existens in GD plano, rectus ergo qui sub ZIE angulus. Sed EZ, AB plano ad rectos est, ergo qui sub EZI rectus est. Trigoni ergo EZI duo anguli duobus rectis sunt equales. Quod impossibile. Non ergo qui ab E, AB planum cathetus ductus extra cadet DA, ad DA ergo cadet.

38
lat Gerard
No Latin
lat Adelard
No Latin
lat Hermann
No Latin
ara Uppsala
No Arabic
ara Tuṣi
No Arabic
ara Nairizi
No Arabic
san
No Sanskrit
lat Clavius
No Latin
kin 幾何原本
No Chinese
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