 | John Clark (drawing master.) - 1840 - 208 σελίδες
...way. Vertical or Perpendicular Lines are those which are drawn perfectly upright. When a straight une standing on another straight line makes the adjacent angles equal to one another, then the upright une which stands on the other is called a perpendicular to it. The drawing of a perpendicular... | |
 | Euclides - 1841 - 378 σελίδες
...angle at a point, it may be ' expressed by a le:ter 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... | |
 | Euclides - 1842 - 316 σελίδες
...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... | |
 | John Playfair - 1842 - 332 σελίδες
...an* gle at a point, it may be expressed by a letter placed at that point ; as the 'angle at E.' 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... | |
 | Philip Kelland - 1843 - 168 σελίδες
...When a straight line standing on another makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight...stands on the other is called a perpendicular to it. By looking over the propositions of Euclid's first Book it will be seen that the only definitions which... | |
 | William Pease - 1843 - 80 σελίδες
...that which is formed on the surface of a sphere, by the intersection of two of its great circles. 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... | |
 | Euclid - 1845 - 218 σελίδες
...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 tine which stands on the other is called a perpendicular... | |
 | Scottish school-book assoc - 1845 - 444 σελίδες
...» only one angle at the point, as at E, it may be called simply the »ngle at E, PLANE GEOMETRY. 9. 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 strnight line which stands on the other is called a perpendicular... | |
 | Euclides, James Thomson - 1845 - 382 σελίδες
...line standing on another makes the adjacent angles equal, each of the angles is called a right ample; and the straight line which stands on the other is called a perpendicular to it, and is said to be at right angles to it. 9. An obtuse angle is that which is greater than a right angle.... | |
 | Euclides - 1845 - 546 σελίδες
...be only one angle at a point, it may be expressed by the letter at that point; as the angle at /.'. When a straight line standing on another straight line makes the adjacent angles equal to each other, each of these angles is called a right angle ; and the straight line which stands on the... | |
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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. 
