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 - 1857 - 226 pagesFull view - About this book
| Robert Simson - Trigonometry - 1762 - 466 pages
...adjacent angles. but when the adjacent angles which one ftraight line makes with another ftraight line are **e.qual to one another, each of them is called a right ,* angle** ; therefore Def each of the angles DCF, ECF is a right angle. wherefore from the given point C in the... | |
| Robert Simson - Trigonometry - 1775 - 520 pages
...to the angle CHG; and they are adjacent angles ; but when a ftraight line ftanding cet on a ftraight **line makes the adjacent angles equal to one another, each of them is** a right angle, and the ftraight line which flands upon the other is called a perpendicular to it; therefore... | |
| Robert Simson - Trigonometry - 1781 - 466 pages
...the angle CHG; and they are adjacentc. 8. i. angles. but when a ftraight line ftanding on a ftraight **line makes the adjacent angles equal to one another, each of them is** aright angle, and the ftraight linewhich ftands upon the other is called a perpendiculartoit. therefore... | |
| John Playfair - Euclid's Elements - 1795 - 444 pages
...to the 111 .le CKG ; and they are adjacent angles; but when a ftraight line ftanding on a ftraight **line makes the adjacent angles equal to one another, each of them is** a right angle, and the flraight line which ftands upon the other is called a perpendicular to it ;... | |
| Alexander Ingram - Trigonometry - 1799 - 351 pages
...to the angle , CHG ; and they are adjacent angles ; but when a ftraight line ftanding on a ftraight **line makes the adjacent angles equal to one another, each of them is** a right angle, and the ftraight line which ftands upon the other, is called a perpendicular to it ;... | |
| Robert Simson - Trigonometry - 1804
...angle CHG; and they are adjacent e. 8. i. :angles. but when a ftraight line flanding on a ftraight **line makes the adjacent angles equal to one another, each of them is** a right angle, and the ftraight line which ftands upon the other is called af perpen- f. to.Def.t.... | |
| John Playfair - Euclid's Elements - 1804 - 470 pages
...therefore the angle AFE is equal b to the angle BFE. And when a ftraight line flanding upon another **makes the adjacent angles equal to one another, each of them is** a right c angle : Therefore each of the angles AFE, BFE is a right angle; wherefore the ftraight line... | |
| Robert Simson - Trigonometry - 1806 - 518 pages
...G * : therefore the angle ADG is equal c 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: but FDB is likewise a '"... | |
| John Playfair - Euclid's Elements - 1806 - 311 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... | |
| Euclid - Geometry - 1810 - 518 pages
...equal e to the angle CHG; and 1. they are adjacent angles; but when a straight line standing on ae 8. 1 **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 to it; therefore... | |
| |