 | John Playfair - 1819 - 354 pagina’s
...equal (8. 1.) to the angle CHG ; and thry are adjacent angles ; now when a straight lina standing on a straight line makes the adjacent angles equal to one another, each of them is a right angle, and the straight line which stands upon the other is called a perpendicular... | |
 | Pierre Simon marquis de Laplace, Thomas Young - 1821 - 402 pagina’s
...described by three letters placed near the lilies, the middle letter at the angular point % 64. DEFINITION. When a straight line standing on another straight line makes the adjacent angles equal, they are called right angles. 65. DEFINITION. A straight line between two right angles is called a... | |
 | Peter Nicholson - 1825 - 1046 pagina’s
...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 : (Ю. Def. 1 .) Therefore the angle GDB is a right angle. But FDB is likewise a right... | |
 | George Lees - 1826 - 276 pagina’s
...When a straight line AB, standing on another straight line CD, makes the adjacent angles ABC and ABD equal to one another, each of the angles is called...and the straight line, which stands on the other, is called a perpendicular to it. •D OF GEOMETRY. with another CD, upon one side of it, are eitlier two... | |
 | Euclides - 1826 - 226 pagina’s
...are right lines, it is called a rectilineal angle. 10. When a right line standing on another right line, makes the adjacent angles equal to one another, each of the equal angles is a right angle, and the right Tine standing on the other is called a perpendicular.... | |
 | Euclid - 1826 - 234 pagina’s
...are right lines, it is called a rectilineal angle. 10. When a right line standing on another right line, makes the adjacent angles equal to one another, each of the equal angles is a right angle, and the right line standing on the other is called a perpendicular.... | |
 | Robert Simson - 1827 - 546 pagina’s
...: therefore the angle CHF is equal * to the angle * 8. 1. CHG ; and they are adjacent angles : but when a straight line, standing on another straight...the adjacent angles equal to one another, each of them is a right angle, and the straight line which stands upon the other, is called a perpendicular... | |
 | Thomas Curtis - 1829 - 814 pagina’s
...that form the angle, thus С ü D or D В С denotes the angle contained by the line С В and DB. 7. When a straight line standing on another straight...and the straight line which stands on the other is called a PERPENDICULAR. Fig. 4. 8. An OBTUSE ANGLE is that which is greater than a right angle. Fig.... | |
 | John Playfair - 1829 - 210 pagina’s
...one angle at a point, it may be expressed by a letter placed at that point, as -the angle at E. 10. When a straight line standing on another straight line makes the adjacent angles equal to each other, each of the angles is called a right angle; and the straight line which stands on the other... | |
 | John Playfair - 1832 - 358 pagina’s
...: 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 /• jii • • i j_ 1 / rr J f* i \ of the angles is a right angle (7. def. 1.) Therefore the aniile... | |
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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. 
