 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.  Pure mathematics - Page 103by Edward Atkins - 1874Full view - About this book
 | William Ezra Worthen - Architectural drawing - 1857 - 632 pages
...letter placed at that point ; as the angle at E.' When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a rig fit angle ; and the straight lines are said to be perpendicular to each other (fig. 3). An obtuse... | |
 | Euclides - 1858 - 248 pages
...line standing on another straight lino makes the adjacent angles equal to each other, each of these angles is called a right angle; and the straight line...stands on the other is called a perpendicular to it. The angle CD A being equal to angle CDB, each of them is a right angle, and CD is a perpendicular to... | |
 | Euclides - 1860 - 288 pages
...may be called angle n ; and ABD, angle m. 11. When a straight line standing on another straight line makes the adjacent angles equal to one another, each...stands on the other is called a perpendicular to it. 12. The two adjacent angles which one straight line makes with another on the same side of it are called... | |
 | Isaac Todhunter - 1860 - 318 pages
...meet together, but are not in the same straight line. And when a straight line standing on another makes the adjacent angles equal to one another, each of the angles is called a right angle. A right angle is divided into 90 equal parts called degrees, a degree is divided into 60 equal parts... | |
 | Robert Potts - Geometry, Plane - 1860 - 380 pages
...ADG is equal to the angle GDB : (I. 8.) but when a straight line standing upon another straight line makes the adjacent angles equal to one another, each of the angles is a right angle ; (I. def. 10.) therefore the angle GDB is a right angle : but FDB is likewise a right... | |
 | William Schofield Binns - 1861 - 238 pages
...or cutting each other in a point, as c (10) " When a straight line standing on another straight line makes the adjacent angles equal to one another, each...stands on the other is called a perpendicular to it." The angles AB c, ABD, are right angles. Obs. 1. Because DB is in the same straight line with B c, the... | |
 | Euclides - 1861 - 464 pages
...st. line makes the adj. ¿_s equal to each other, each of these /.s is called a rt. ¿_ ; and the st. line which stands on the other is called a perpendicular to it. Ax. 1. Things which are equal to the same thing are equal to one another. EI 2 CI 2 Dat. Quass. Pst.... | |
 | Euclides - 1862 - 140 pages
...ADG is equal to the angle BDG. (1. 8.) 6. But when a straight Hue, standing on another straight line, makes the adjacent angles equal to one another, each of the angles is called a right angle; (I. def. 10.) 7. Therefore the angle GDB is a right angle. 8. But the angle FDB is also a right angle,... | |
 | Euclides - 1862 - 172 pages
...must be equal to the angle GDB ; (L, 8) but ' when a straight line standing upon another straight line makes the adjacent angles equal to one another, each of the angles is a right angle;' (i. def. 10) therefore the angle GDB must be a right angle ; but FOB is a right angle;... | |
 | Euclides - 1863 - 74 pages
...line makes the adjacent angles equal to each other, each of these angles is called a right angle; D and the straight line which stands on the other is called a perpendicular to it. , The Anglo CDA being equal to angle CDB, each of them is a right angle, and CD is perpendicular toAB.... | |
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