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Euclid: Elementa

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eng
Q. E. F.
lat Clavius
Quod faciendum erat.

PRAXIS
SVMATVR recta D E, æqualis cuicunque rectarum datarum, nempe ipsi B, quam nunc volumus esse basin. Deinde ex D, ad interuallum rectæ A, arcus describatur: Item ex E, ad interuallum rectæ C, alter arcus secans priorem in F. Si igitur ducantur rectæ D F, E F, factum erit triangulum habens tria latera æqualia tribus datis lineis. Erit enim latus D F, æquale rectæ A, propter interuallum ipsius A, assumptum: & latus E F, ipsi C, propter assumptum interuallum C: D E, vero latus, acceptum est rectæ B, æquale, ab initio.

SCHOLION
HAC arte cuicunque triangulo proposito alterum prorsus æquale & quoad latera, angulosque & quoad aream ipsius, constituemus. Sit namque triangulum quodcunque A B C, cui æquale omni ex parte est construendum. Intelligo eius latera, tanquam tres lineas rectas datas A B, B C, C A, quarum quælibet duæ maiores sunt reliqua. Deinde sumo rectam D E, æqualem uni lateri, nempe B C; & ex D, interuallo lateris A B, arcum describo, item alium ex E, interuallo reliqui lateris C A, qui priorem secet in F, &c.
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