 | Euclid - 1904 - 488 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... | |
 | Calvin Franklin Swingle - 1906 - 490 sider
...same straight line as in Fig. 34. Fi(. 34. Fig 35. 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 as in Fig 35. Fig. 38. An obtuse... | |
 | Joseph H. Rose - 1906 - 340 sider
...same straight line as in Fig. 1. Fig. 1. Fig. 2. 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 as in Fig. 2. GEOMETEIIAI A... | |
 | Charles Westinghouse - 1906 - 168 sider
...are not in the same straight line as in Fig. 34. 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 as in Fig. 35. An obtuse angle... | |
 | Henry Sinclair Hall - 1908 - 286 sider
...also vertically opposite to one another. 7, When one straight line stands on another so as to make the adjacent angles equal to one another, each of the angles is called a right angle • and each line is said to be perpendicular to the other. AXIOMS, (i) If O is a point in a straight line... | |
 | Euclid - 1908 - 550 sider
...the angle ECF; [i. 8] and they are adjacent angles. But, when a straight line set up on a straight line makes the adjacent angles equal to one another, each of the equal ingles is right ; [Def. 10] therefore each of the angles DCF> FCE is right. Therefore the straight... | |
 | David Eugene Smith - 1911 - 360 sider
...confine our attention to having the concept understood. 10. 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... | |
 | Calvin Franklin Swingle - 1913 - 1270 sider
...same straight line as in Fig. 34. Fig. 34. Fig. 35. 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 as in Fig 35. Fig. 36. An obtuse... | |
 | D. Ponton - 1927 - 168 sider
...made when two straight lines cross one another. 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. A right angle contains 90... | |
 | Rudy von Bitter Rucker - 1977 - 166 sider
...postulate is not clear until we have defined right angles: "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." This postulate seems to be equivalent to the assumption that the things we... | |
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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. 
