 | Euclid - 1833 - 216 pàgines
...the sides. 11. When a right line standing on another makes Fig. 3. the adjacent angles (ABC and ABD) equal to one another, each of these angles is called a right angle ; B and the right line, which stands on the other, is called a perpendicular to it. Fig. 1. 12. The... | |
 | Euclid - 1835 - 540 pàgines
...centre G * : Therefore the angle ADG is equal0 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 :d Therefore the angle GDB is a right angle: But FDB is likewise a right... | |
 | 1835 - 684 pàgines
...letter, as A, always denotes the angular point. 10. (Eue. i. det 10.) When a straight line standing; upon another straight line makes the adjacent angles equal to one another, each of them is called a right angle, and the straight line which stands upon the other is called a perpendicular... | |
 | 1836 - 488 pàgines
...of two straight lines to one another, which meet together but are not in the same straight line. 7. When a straight line standing on another straight...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... | |
 | John Playfair - 1836 - 488 pàgines
...angle at a point, it may be expressed by a letter placed ' at that point ; as the angle at E.' VII. When a straight line standing on another straight line makes the adjacent angles equal to one an, other, each of the angles is called a right angle; and the straight line which stands on the other... | |
 | George Darley - 1836 - 172 pàgines
...figure bounded by three right lines, ibid. DF.F. VI. If one right line, standing upon another, make the adjacent angles equal to one another, each of these angles is called a ri9ht angle, and the right line which stands upon the other is called a perpendicular to it, 12. DEF.... | |
 | John Playfair - 1836 - 148 pàgines
...therefore the angle ADG is equal (7. 1.) to the angle BDG ; 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 (Def. 27. 1.); therefore BDG is a right angle ; but BDF is likewise a right... | |
 | James Thomson (LL.D.) - 1837 - 296 pàgines
...divergence. II. When one straight line standing on another, makes with it two angles which are equal, each of these angles is called a RIGHT ANGLE ; and...which stands on the other is said to be PERPENDICULAR, Or AT RIGHT ANGLES, tO it, or tO be a PERPENDICULAR to it. III. An OBTUSE ANGLE is greater than a right... | |
 | Euclid, James Thomson - 1837 - 410 pàgines
...meet one another.^ The point in which the straight lines meet is called the vertex of the angle. 8. When a straight line standing on another straight...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... | |
 | John Playfair - 1837 - 332 pàgines
...therefore the 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. i .) Therefore the angle GDB is a right angle : But FDB is likewise... | |
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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. 
