 | Euclides - 1864 - Liczba stron: 262
...15.) therefore the angle AFE is equal to the angle BFE; (l. 8.) but when a straight line standing upon another straight line makes the adjacent angles equal to one another, each of them is a right angle ; (l. def. 10.) therefore each of the angles AFE, BFE, is a right angle : wherefore the straight line... | |
 | Euclides - 1864 - Liczba stron: 448
...that which is contained by lOB, 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 - 1865 - Liczba stron: 80
...straight line standing on another straight line makes the adjacent angles equal, each of them is called a RIGHT ANGLE; and the straight line which stands upon the other is called a PERPENDICULAR to it. 10. An OBTUSE ANGLE is that which is greater than a right angle. 11. An ACUTE ANGLE is that... | |
 | Robert Potts - 1865 - Liczba stron: 528
...and that which is contained by DB, CB, is called the angle DBC, or CBD, 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 liae which stands on the other ia called a... | |
 | Euclides - 1865 - Liczba stron: 402
...expressed by a letter placed at that point : as the angle at !•'.. 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... | |
 | William Harris Johnston - 1865 - Liczba stron: 478
...other angle between them, such as the angles ВАС and DA 0. When one straight line standing upon another straight line makes the adjacent angles equal to one another, each such angle is called a right angle, and either of the straight lines is said to be a perpendicular... | |
 | Edward Clarke Lowe - 1866 - Liczba stron: 172
...another, which meet together, but are not in the same straight line. 10. 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 & perpendicular... | |
 | Euclid, Isaac Todhunter - 1867 - Liczba stron: 426
...Def. 15. therefore the angle AFE is equal to the angle BFE. [I. 8. But 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 ; [I. Definition 10. therefore each of the angles AFE, BFE is a... | |
 | Robert Potts - 1868 - Liczba stron: 434
...that which is contained by DB, CB, is called the angle DBG, or CBD. I 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... | |
 | E. M. Reynolds - 1868 - Liczba stron: 172
...two. When an angle stands alone one letter only is often used, as A. When one 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 said to be... | |
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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. 
