| Euclid - 1837 - عدد الصفحات: 390
...lines meet is called the vertex of the angle. 8. When a straight line standing on another straight **line makes the adjacent angles equal to one another,...each of the angles is called a right angle; and the** straight line which stands on the other is called a perpendicular to it, and is said to be at right... | |
| Euclides - 1838
...letter placed at that point; as the angle at E.VIII. When a straight line standing on another straight **line makes the adjacent angles equal to one another,...each of the angles is called a right angle ; and the** straight lines are said to be perpendicular to each other. IX. An obtuse angle is that which is greater... | |
| Euclides - 1841
...is equal* to the £"" * 3. 1. angle GDB : but when a straight line, standing upon another straight **line, makes the adjacent angles equal to one another, each of the angles is** a right* angle: *iODef. therefore the angle GDB is a right angle : but FDB *' is likewise a right angle;... | |
| Euclides - 1842
...angle ADG is equal (8. 1.) to the angle GDB. But when a straight line standing upon another straight **line makes the adjacent angles equal to one another, each of the angles is** a right angle (lO.Def. 1.); therefore the angle GDB is a right angle : but FD в is likewise a right... | |
| John Playfair - 1842 - عدد الصفحات: 317
...angle ADG is equal (8. 1.) to the angle GDB : But when a straight line standing upon another straight **line makes the adjacent angles equal to one another, each of the angles is** a right angle (7. def. 1.) Therefore the angle GDB is a right angle: But FDB is likewise a right angle:... | |
| William Pease - 1843 - عدد الصفحات: 68
...the intersection of two of its great circles. X. When a straight line standing on another straight **line, makes the adjacent angles equal to one another,...each of the angles is called a right angle ; and the** straight line which stands on the other is called a perpendicular to it. Beginners are apt to suppose... | |
| Philip Kelland - 1843 - عدد الصفحات: 147
...centre is the angular point, as trigonometers often make it. 7. When a straight line standing on another **makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the** straight line which stands on the other is called a perpendicular to it. By looking over the propositions... | |
| 1845
...called simply the »ngle at E, PLANE GEOMETRY. 9. When a straight line standing on another straight **line makes the adjacent angles equal to one another,...each of the angles is called a right angle; and the** strnight line which stands on the other is called a perpendicular to it. 10. An obtuse angle is that... | |
| Euclid - 1845 - عدد الصفحات: 199
...ADGisequalJ to the angle GDB : but ~ ^J£^.." t i. .. when a straight line standing upon another straight **line makes the adjacent angles equal to one another, each of the angles is** a right angle ||; therefore I! 10. Def the angle GDB is a right angle : But FDB is likewise a§ right... | |
| Robert Potts - 1845
...angle ADG is equal to the angle GDB: (i. 8.) but when a straight line standing upon another straight **line makes the adjacent angles equal to one another, each of the angles is** a right angle; (i. def. 10.) therefore the angle GDB is a right angle : but FDB is likewise a right... | |
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