Bibliotheca Polyglotta

Euclid: Elementa

Καὶ φανερόν, ὅτι εὕρηνται πάλιν δύο τετράγωνοι ὅ τε ἀπὸ τοῦ ΒΔ καὶ ὁ ἀπὸ τοῦ ΓΔ, ὥστε τὴν ὑπεροχὴν αὐτῶν τὸν ὑπὸ ΑΒ, ΒΓ εἶναι τετράγωνον, ὅταν οἱ ΑΒ, ΒΓ ὅμοιοι ὦσιν ἐπίπεδοι.

eng

And it is manifest that two square numbers, the square on BD and the square on CD, have again been found such that their difference, the product of AB, BC, is a square, whenever AB, BC are similar plane numbers.

lat Sic

Et manifestum quoniam inventi sunt rursum duo tetragoni ille scilicet qui a numero BD et ille qui a numero GD. Quare differentiam ipsorum eum scilicet qui sub numeris AB, BG tetragonum esse, quando numeri AB, BG similes fuerint epipedi.

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