 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.  Elements of Geometry and Conic Sections - Page 10by Elias Loomis - 1849 - 226 pagesFull view - About this book
 | John Mason Good - 1813 - 714 pages
...another, which 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 - 1814 - 560 pages
...8. i. fore the angle AFE is equal b to the angle BFE: But when a straight linestanding upon another makes the adjacent angles equal to one another, each of them is a right 0 angle: Therefore each of the angles AFE, BFE, is a right angle ; wherefore the straight line... | |
 | Euclides - 1816 - 588 pages
...centre G*: Therefore the angle ADG is equal0 to the angle GDB : 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 d: Therefore the angle GDB is a right angle: MoDef. ' But FDB is likewise... | |
 | John Playfair - 1819 - 354 pages
...expressed by a letter placed at that point ; as the angle at E.' VII. 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... | |
 | John Playfair - Circle-squaring - 1819 - 350 pages
...therefore the angle AFE is equal (8. 1.) to the angle BFE. And when a straight line standing upon another makes the adjacent angles equal to one another, each of them is a right (7. Def. 1.) angle : Therefore each of the angles AF£, BFE is a right angle ; wherefore the... | |
 | Peter Nicholson - Mathematics - 1825 - 1046 pages
...expressed by a letter placed at that point ; as the angle at E.' 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 - 1826 - 226 pages
...to the angle CHE, b and they are adjacent angles. But when a right line standing upon another right line makes the adjacent angles equal to one another, each of them is a right angle, and the right line standing upon the other is called a perpendiFor because GH is equal... | |
 | Euclid - 1826 - 234 pages
...to the angle cHE,b and they are adjacent angles. But when a right line standing upon another right line makes the adjacent angles equal to one another, each of them is a right angle, and the right Hue standing upon the other is called a perpendi«ic.Def.i. cular;0 wherefore... | |
 | Robert Simson - Trigonometry - 1827 - 546 pages
...expressed ' by a letter placed at that point : as the angle at E.' X. 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... | |
 | Thomas Curtis - Aeronautics - 1829 - 814 pages
...or D В С denotes the angle contained by the line С В and DB. 7. 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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