 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 - Page 167by Euclid - 1908Full view - About this book
 | Euclides - 1853 - 146 pages
...8.) 1. The angle AFE is equal to the angle BFE: y -iy 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... | |
 | Euclides - 1855 - 270 pages
...Therefore the angle ADG is equal (I. 8) to the angle GD B. But when a straight line standing upon another straight line makes the adjacent angles equal to one another, each of these angles is a right angle (I. Def. 10). Therefore the angle GDB is a right angle. But FDB is likewise... | |
 | Robert Rawson - 1856 - 178 pages
...expressed by a 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 right angle ; and the straight line which stands on the other is called a perpendicular... | |
 | W.E. WORTHEN - 1857 - 600 pages
...expressed by a 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 right angle; and the straight lines are said to be perpendicular to each other (fig.... | |
 | William Ezra Worthen - Architectural drawing - 1857 - 632 pages
...expressed by a 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... | |
 | Elias Loomis - Conic sections - 1858 - 256 pages
...angle ECD is the difference between the two angles BCD, BCE. 10. When a straight line, meeting another straight line, makes the adjacent angles equal to one another, each of them is called a right angle, and the straight line which meets the other is called a perpendicular... | |
 | Robert Potts - Geometry, Plane - 1860 - 380 pages
...the angle GHC; (I. 8.) 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 them is a right angle, and the straight line which stands upon the other is called a perpendicular... | |
 | Popular educator - 1860 - 536 pages
...(I. 4) to the angle CBO ; 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 them is a right angle, and the straight line which stands upon the other is called a perpendicular... | |
 | William Schofield Binns - 1861 - 238 pages
...another, meeting 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 of the angles is called a right angle; and the straight line which stands on the other is called a perpendicular... | |
 | Euclides - 1862 - 172 pages
...is equal to the angle CHG; (l. 8) 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... | |
| |
