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Geometric algebra: Book 2 Definitions

Translations

α΄.Πᾶν παραλληλόγραμμον ὀρθογώνιον περιέχεσθαι λέγεται ὑπὸ δύο τῶν τὴν ὀρθὴν γωνίαν περιεχουσῶν εὐθειῶν.β΄.Παντὸς δὲ παραλληλογράμμου χωρίου τῶν περὶ τὴν διάμετρον αὐτοῦ παραλληλογράμμων ἓν ὁποιονοῦν σὺν τοῖς δυσὶ παραπληρώμασι γνώμων καλείσθω.

1.Any rectangular parallelogram is said to be contained by the two straight lines containing the right angle.2. And in any parallelogrammic area let any one whatever of the parallelograms about its diameter with the two complements be called a gnomon.