Bibliotheca Polyglotta

Euclid: Elementa

κα῾ Κύλινδρός ἐστιν, ὅταν ὀρθογωνίου παραλληλογράμμου μενούσης μιᾶς πλευρᾶς τῶν περὶ τὴν ὀρθὴν γωνίαν περιενεχθὲν τὸ παραλληλόγραμμον εἰς τὸ αὐτὸ πάλιν ἀποκατασταθῇ, ὅθεν ἤρξατο φέρεσθαι, τὸ περιληφθὲν σχῆμα.

eng

21. When, one side of those about the right angle in a rectangular parallelogram remaining fixed, the parallelogram is carried round and restored again to the same position from which it began to be moved, the figure so comprehended is a cylinder.

lat Sic

Chilindrus est, quando orthogonii parallilogrammi manente uno latere eorum que circa rectum angulum circumductum parallilogrammum in idem rursum restitutum fuerit unde incepit ferri, circumsumpta forma.

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