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Euclid: Elementa

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gre I,0
κ῾ Τῶν δὲ τριπλεύρων σχημάτων ἰσόπλευρον μὲν τρίγωνόν ἐστι τὸ τὰς τρεῖς ἴσας ἔχον πλευράς, ἰσοσκελὲς δὲ τὸ τὰς δύο μόνας ἴσας ἔχον πλευράς, σκαληνὸν δὲ τὸ τὰς τρεῖς ἀνίσους ἔχον πλευράς.
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eng
20. Of trilateral figures, an equilateral triangle is that which has its three sides equal, an isosceles triangle that which has two of its sides alone equal, and a scalene triangle that which has its three sides unequal.
lat Sic
Trilaterarum figurarum isopleurum quidem trigonum est quod tria equalia habet latera, isoskeles vero quod duo sola, scalenon quod tria inequalia habet latera.
lat Gerard
[xxi] Figurarum vero tria habentium latera, alia est triangulus equilaterus qui tria habet latera equalia. Alia est duorum equalium laterum cuius duo latera ex omnibus eius lateribus tantum sunt equalia. Alia est triangulus diversorum laterum cuius tria latera sunt inequalia.
lat Adelard
Figurarum trilaterarum alia est triangulus tria habens equalia latera, alia triangulus duo habens equalia, alia est triangulus trium inequalium laterum.
lat Hermann
Figurarum trilaterarum: alia est triangulus tria habens equalia latera.
Alia: triaugulus duo habens equalia.
Alia est: triangulus trium inequalium laterum.
ara Uppsala 2r9-12
[٢٠] وأما الأشكال ذوات الأضلاع الثلاثة فإن منها المثلث المتساوي الأضلاع ' وهو الذي أضلاعه الثلاثة متساو بعضها لبعض ومنها المتساوي الساقين وهو ' الذي ضلعان فقط من أضلاعه متساويان ومنها المختلف الأضلاع وهو الذي ' أضلاعه الثلاثة مخالف بعضها لبعض
ara Tuṣi p. 3
وأولها المثلث ومنه المتساوي ' الأضلاع والمتساوي الساقين فقط والمختلف الأضلاع
per Shirazi p. 9,5-7
و اول ان مثلث است و او یا متساوی الاضلاع باشد یا متساوی الساقین فقط یا مختلف الاضلاع
san 5,7-9
(7) tatrādau tribhujam ucyate | (8) tat trividham | ekaṃ samatribāhukam | dvitīyaṃ samadvibāhukam | (9) tṛtīyaṃ viṣamatribāhukam |
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lat Clavius p. 16-17
XXIII. TRILATERARVM autem figurarum, Æquilaterum est triangulum, quod tria latera habet æqualia.
DESCENDIT iam ad singulas species triangulorum. Quia verò triangula diuidi possunt vel habita ratione laterum, vel angulorum, declar at prius species prioris diuisionis, quæ tres sunt duntaxat, quod tria latera tribus tantum modis sese possint habere. Aut enim omnia æqualia sunt; aut duo tantum, tertio existente vel matore, vel minore; aut omnia inæqualia. Quando igitur omnia tria latera inter se æqualia sunt, dicitur triangulum Æquilaterum. Porro ex æqualitate omnium trium laterum trianguli æquila teri infertur, omnes tres eius angulos æquales quoque esse, ceu ad quiætam propositionem huius libri demonstrabimus.
XXIV. ISOSCELES autem est, quod duo tantum æqualia habet latera.
EX hac rursum æqualitate duorum laterum trianguli Isoscelis efficitur, duos angulos super reliquum latus etiam esse æqualles, vt demonstrabit Euclides propos 5 huius Iibri. Apposuimus autem duo triangula psoscelia, quorum prius habet tertium latus vtrouis æqualium maius, losterius autem idem minus obtinet: ita vt duæ sint species triangui Isoscelis; alterum, cuius tertium latus sit vtrouis æqualium maius, & alterum, cuius tertium latus vtrouis æqualium minus sit.
XXV. SCALENVM vero est, quod tria inæqualia habet latera.
HIC denique exinæqualitate omnium laterum trianguli Scaleni colligitur omnium angulorum inæqualitas, vt ostendetur propositio 18. huius 1. liber Porro ex his constat, eodem modo potuisse diuidi triangulum in tres speties, si æqualitatis angulorum ratio haberetur Cum enim aut omnes tres anguli sint inter se æquales; aut duo tantum, tertio maiore, vel minore existente; aut omnes tres inæquales; erit omne triangulum vel æquiangulum, habens tres omnes angulos æquales: vel duorum tantum angulorum æqualium: vel omnium angulorum inæqualium; quorum primum quidem Æ quilatero, secundum vero Isosceli, tertium denique Scalenorespondet triangulo. Cæterum quanam arte construenda sint triangula huius partitionis super quauis data recta linea finita, trademus propositio 1. huius liber.
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kin 幾何原本 p.8-9
第二十三界
三邊形三邊線等。為平邊三角形。
第二十四界
三邊形。有兩邊線等。為兩邊等三角形。或銳或鈍。(p. 九)
第二十五界
三邊形。三邊線俱不等。為三不等三角形。
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