 | Isaac Todhunter - 1880 - 426 sider
...angle A FE 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 A FE, BFE is a right angle. Therefore the straight... | |
 | Marianne Nops - 1882 - 278 sider
...sharp). These are thus defined by Euclid : — 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 to it.' 11. 'An obtuse angle is that... | |
 | Euclides - 1883 - 176 sider
...L DCF = L ECF, and these are adjacent angles. 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. .-. CF is at right angles to AB, and is drawn from the given point CQEF NSte.— Since an angle may... | |
 | Euclid, Isaac Todhunter - 1883 - 428 sider
...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 right angle. Therefore the straight... | |
 | Stewart W. and co - 1884 - 272 sider
...named from three or one letters, as ABC or B. 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 to it. XI. An obtuse angle is greater... | |
 | 1884 - 862 sider
...same straight line [plane]. X. When a straight line [plane] standing on another straight line [plane] makes the adjacent angles equal to one another, each of the angles is called a right angle [right dihedral angle]. XV. A circle [cone of revolution with vertex at the eye] is a figure contained... | |
 | John Thornton - 1888 - 266 sider
...the following definition of a right angle : — ' 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.' We find it convenient for... | |
 | Edward Mann Langley, W. Seys Phillips - 1890 - 538 sider
...instead of it. See Note 2 on Prop. 9. DEF. 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 said to be perpendicular, or at right angles, to it. The... | |
 | 1898 - 610 sider
...6m, is named the angle с m Ъ. — When a straight line, cm, standing on another straight line, a b. makes the adjacent angles equal to one another, each of the angles erne, cmb, is culled a right anglr; and the straight lines are said to be perpendicular to each other.... | |
 | Euclid, Henry Sinclair Hall, Frederick Haller Stevens - 1900 - 330 sider
...are also vertically opposite to one another. 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 to it. 1 1 . An obtuse angle is an... | |
| |
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. 
