 When a straight line set up on a straight line makes the adjacent angles equal to one another, each of the equal angles is right, and the straight line standing on the other is called a perpendicular to that on which it stands.  Introduction and books 1,2 - Страница 167написао/ла Euclid - 1908Пуни преглед - О овој књизи
 | Alfred Hiley - 1871 - 184 страница
...AC, but upon the extent or opening between the lines. XI. When a straight line standing upon another straight line makes the adjacent angles equal to one another, each of them is called a right A angle ; and the straight line standing upon the other is called a perpendicular... | |
 | Henry Major - 1873 - 588 страница
...therefore the angle CHF is equal to CHG ; and they are adjacent angles ; but when a straight line 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... | |
 | William Alexander Myers - 1873 - 238 страница
...concentric circles ; *that is, having a common center, as at F. 14. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is a right angle, and the straight line which stands on the other is called a perpendicular... | |
 | William Alexander Myers - 1874 - 207 страница
...concentric circles ; that is, having a common center, as at F. 14. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is a right angle, and the straight line which stands on the other is called a perpendicular... | |
 | Euclides - 1874 - 120 страница
...meet together, but are not in the same straight line. 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... | |
 | Euclides - 1874 - 342 страница
...1. The angle AFE is equal to the angle BFE (I. 8) ; but when a straight line standing upon another straight line, makes the adjacent angles equal to one another, each of them is a right angle (I. Def. 10) ; therefore 2. Each of the angles AFE, BFE is a right angle ; wherefore... | |
 | John Clement P. Aldous - 1874 - 104 страница
...one well-known angle by which angles may be measured. DBF. When one straight line standing on another straight line makes the adjacent angles equal to one another, each of these angles is called a Bight Angle. Now all right angles are equal to one another. So that any angle... | |
 | Francis Cuthbertson - 1874 - 400 страница
...and.-. AE is =BE; (i. i) ( 14 ) RIGHT ANGLES. DEFINITION. When one straight line, standing on another straight line, makes the adjacent angles equal to one another, each of them is called a right angle; and the straight line which stands upon the other is said to be perpendicular... | |
 | Henry Lewis (M.A.) - 1875 - 104 страница
...it is, perhaps, a little too difficult for beginners: — When a straight line standing on another straight line makes the adjacent angles equal to one another, each of these angles is called a right angle. An acute angle is less than a right angle, as ABD, DEE. An obtuse... | |
 | Edward Atkins - 1876 - 130 страница
...to the angle CHG (I. 8), and they 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, and the straight line which stands on the other is called a perpendicular... | |
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