Bibliotheca Polyglotta

Euclid: Elementa

eng

In acute-angled triangles the square on the side subtending the acute angle is less than the squares on the sides containing the acute angle by twice the rectangle contained by one of the sides about the acute angle, namely that on which the perpendicular falls, and the straight line cut off within by the perpendicular towards the acute angle.

lat Clavius

IN oxygoniis triangulis, quadratum a latere angulum acutum subtendente minus est quadratis, quae fiunt à lateribus acutum angulum comprehendentibus, rectangulo bis comprehenso, & ab vno laterum, quæ sunt circa acutum angulum, in quod perpendicularis cadit, & ab assumpta interius linea sub perpendiculari prope acutum augulum.

kin 幾何原本 p. 107

三邊銳角形之對銳角邊上直角方形。小於餘邊上兩直角方形幷、之較。為銳角旁任用一邊、偕其對角所下垂線旁之近銳角分線、矩內直角形、二。

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