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Euclid: Elementa

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Euclid: Elementa
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Euc
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gre ΙΙI,18
Ἐὰν κύκλου ἐφάπτηταί τις εὐθεῖα, ἀπὸ δὲ τοῦ κέντρου ἐπὶ τὴν ἁφὴν ἐπιζευχθῇ τις εὐθεῖα, ἡ ἐπιζευχθεῖσα κάθετος ἔσται ἐπὶ τὴν ἐφαπτομένην.
Pic2530
eng
If a straight line touch a circle, and a straight line be joined from the centre to the point of contact, the straight line so joined will be perpendicular to the tangent.
lat Sic
Si circulum contingat aliqua recta, a centro vero in contactum recta quedam copuletur, copulata cathetus erit super contingentem.
lat Gerard
No Latin
lat Adelard
No Latin
lat Hermann
Quando circulum recta linea contingit si a contactu linea versus centrum consurgat: contingenti perpendicularis erit.
ara Uppsala
No Arabic
ara Tuṣi
No Arabic
ara Nairizi
No Arabic
per Shirazi
.
san
No Sanskrit
lat Clavius p. 273
SI circulum tangat recta quæpiam linea, a centro autem ad contactum adiungatur recta quædam linea: quæ adiuncta fuerit, ad ipsam contingentem perpendicularis erit.
kin 幾何原本 p. 147
直線切圜。從圜心作直線、至切界。必為切線之垂線。
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