In a circle the angle in the semicircle is right, that in a greater segment less than a right angle, and that in a less segment greater than a right angle; and further the angle of the greater segment is greater than a right angle, and the angle of the less segment less than a right angle.
In circulo angulus quidem qui in semicirculo rectus est, qui vero in maiori sectione minor recto, qui autem in minori sectione maior recto. Amplius autem maioris quidem sectionis angulus maior est recto, minoris vero sectionis angulus minor est recto.
IN circulo angulus, qui in semicirculo, rectus est: qui autem in maiore segmento, minor recto: qui vero in minore segmento, maior est recto. Et insuper angulus maioris segmenti, recto quidem maior est: minoris autem segmenti angulus, minor est recto.
Title
Book I
