Euclid's Elements of Geometry
ιαʹ. ᾿Αμβλεῖα γωνία ἐστὶν ἡ μείζων ὀρθῆς. the former straight-line is called a perpendicular to that ιβʹ. ᾿Οξεῖα δὲ ἡ ἐλάσσων ὀρθῆς. upon which it stands. ιγʹ. ῞Ορος ἐστίν, ὅ τινός ἐστι πέρας. 11. An obtuse angle is one greater than a right-angle.
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