 | W.E. WORTHEN - 1857 - Liczba stron: 600
...may be expressed by a letter placed at that point; as the angle at E.' 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... | |
 | Elias Loomis - 1858 - Liczba stron: 256
...the angle ECD is the difference between the two angles BCD, BCE. 10. When a straight line, meeting another straight line, makes the adjacent angles equal to one another, each of them is called a right angle, and the straight line which meets the other is called a perpendicular to it.... | |
 | Popular educator - 1860 - Liczba stron: 536
...angle CHF (I. 4) to the angle CBO ; and they are adjacent angles. But when a straight line standing on another straight line makes the adjacent angles...which stands upon the other is called a perpendicular (l)'f. 10) to it. Therefore from the given point oa perpendicular CH has been drawn to the given straight... | |
 | Robert Potts - 1860 - Liczba stron: 380
...that which is contained by DB, CB, is called the angle DBC, or CBD. X. When a straight line standing on another straight line, makes the adjacent angles equal to one another, each of these angles is called a right angle ; and the straight line which stands on the other is called a... | |
 | Euclides - 1860 - Liczba stron: 288
...point. Thus, angle DBC may be called angle n ; and ABD, angle m. 11. 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... | |
 | William Schofield Binns - 1861 - Liczba stron: 238
...to one another, meeting or cutting each other in a point, as c (10) " 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... | |
 | Janes Boddely Keene - 1861 - Liczba stron: 104
...Fig. 1. 10. Angles are of three kinds. Fig. 2. a. The Right Angle. — If one straight line standing on another straight line makes the adjacent angles equal to one another, each is .called a right angle, and the line standing on the other is said to be perpendicular to it. b.... | |
 | Elias Loomis - 1861 - Liczba stron: 244
...difference between the two angles BCD, BCE. 10. When a straight line, meeting another straight lin® makes the adjacent angles equal to one another, each of them is called a right angle, and the straight line which meets the other is called a perpendicular to it.... | |
 | Euclides - 1862 - Liczba stron: 140
...5. Therefore the angle ADG is equal to the angle BDG. (1. 8.) 6. But when a straight Hue, standing on another straight line, makes the adjacent angles equal to one another, each of the angles is called a right angle; (I. def. 10.) 7. Therefore the angle GDB is a right angle. 8. But... | |
 | Euclides - 1862 - Liczba stron: 172
...therefore the angle ADG must be equal to the angle GDB ; (L, 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 must be a right angle ; but FOB... | |
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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. 
