| John Playfair - 1819 - 354 páginas
...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... | |
| Euclid, Robert Simson - 1821 - 514 páginas
...angle at ' a point, it may be expressed by the letter placed at that point; ' as the angle at E.' X. **When a straight line standing on another straight...which stands on the other is called a perpendicular to** „« —__ it. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle... | |
| Pierre Simon marquis de Laplace, Thomas Young - 1821 - 402 páginas
...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 - 1058 páginas
...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 páginas
...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...stands on the other, is called a perpendicular to it.** •D OF GEOMETRY. with another CD, upon one side of it, are eitlier two right angles, or are, together,... | |
| Euclides - 1826 - 226 páginas
...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 páginas
...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 páginas
...: 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 páginas
...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...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. 5. 9. An ACUTE ANGLE is... | |
| John Playfair - 1829 - 210 páginas
...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... | |
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