 | Pierre Simon marquis de Laplace, Thomas Young - 1821 - 402 sider
...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... | |
 | Euclid - 1822 - 222 sider
...sides. 1 1 . When a right line standing on another makes F,-g 3. the adjacent angles (ABC and ABD) equal to one another, each of these angles is called a right angle ; B ~ Pig. 4Fij7. 4SeeN, Steff, \ \ _\ T" Fij-6. iff. T. Pig. 8. Fvy. 8. F/j- 9. FS.7,, fig. 10. and... | |
 | Peter Nicholson - 1825 - 1046 sider
...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...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... | |
 | George Lees - 1826 - 276 sider
...on another straight line CD, makes the adjacent angles ABC and ABD 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. •D OF GEOMETRY. with another CD, upon one side of it, are eitlier two... | |
 | Robert Simson - 1827 - 546 sider
...one angle at a point, it may be expressed ' by a letter placed at that point : as the angle at E.' X. 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... | |
 | George Darley - 1828 - 190 sider
...which directs their operations. LESSON II. DBF. VI. " If one right line, standing upon another, make the adjacent angles equal to one another, each of these angles is called a right angle, and the right line which stands upon the other is called a perpendicular to it." TEACHER. The shortest way... | |
 | Thomas Curtis - 1829 - 814 sider
...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...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 - 1829 - 210 sider
...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 sider
...: 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... | |
 | Thomas Perronet Thompson - 1833 - 168 sider
...equivalent. But whenever the contrary is not expressed, it is always the direct angle that is meant. XXXVII. 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... | |
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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. 
