 CHG; 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 to...  Elements of Geometry and Conic Sections - Page 10by Elias Loomis - 1861 - 234 pagesFull view - About this book
 | Robert Simson - Trigonometry - 1762 - 488 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 - 534 pages
...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 - 534 pages
...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... | |
 | Euclid, John Playfair - Euclid's Elements - 1795 - 462 pages
...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 - 374 pages
...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 - 530 pages
...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 - 1819 - 354 pages
...the angle CHG ; and thry are adjacent angles ; now when a straight lina 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 to it ;... | |
 | Peter Nicholson - Mathematics - 1825 - 1046 pages
...therefore the angle AFE is equal (8. 1 .) to the angle BFE. Bnt when a straight line standing upon another, makes the adjacent angles equal to one another, each of them is a right (1O Def. 1.) angle : Therefore each of the angles AEF, BFE is a right angle ; •wherefore... | |
 | Euclid - 1826 - 234 pages
...angle ADG is equald to the angle GDB. But when af \ * 8. i. right line standing on another right line ! makes the adjacent angles equal to one \ another, each of them is a right angle.e Therefore the angle GDB is a right angle ; the angle FDB is also a right angle ; therefore... | |
 | Euclides - 1826 - 226 pages
...equal to the angle ECF, and they are adjacent angles. But when a right line standing upon a right line makes the adjacent angles equal to one another, each of them is a right angle: therefore each of the angles DCF, ECF, is a right angle. Wherefore the right line FC... | |
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