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 - Geometry - 1838 - 434 pages
...equal (8. 1.) to the angle CHG; 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 to it ;... | |
| Euclides - 1838 - 264 pages
...EB; therefore the angle AFE is equal* *si to the angle BFE: but when a straight line standing upon **another straight line makes the adjacent angles equal to one another, each** *s Def.i. of u,,,,,, is a right« angle. there_ fore each of the angles AFE, BFE, is a right angle:... | |
| Euclides - 1841 - 378 pages
...expressed by a le:ter 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... | |
| Euclides - 1842 - 320 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... | |
| John Playfair - Euclid's Elements - 1842 - 332 pages
...expressed by a letter placed at that point ; as the 'angle at E.' 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... | |
| William Pease - Geometry - 1843 - 80 pages
...surface of a sphere, by the intersection of two of its great circles. 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... | |
| Scottish school-book assoc - 1845 - 434 pages
...at E, it may be called simply the »ngle at E, PLANE GEOMETRY. 9. 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 strnight line which stands on the other is called a perpendicular... | |
| Euclides - 1845 - 544 pages
...: therefore the angle 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... | |
| Euclid - Geometry - 1845 - 218 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 tine which stands on the other is called a perpendicular... | |
| Euclides - 1846 - 292 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** these angles is called a right angle ; and the straight line which stands on the other is called a... | |
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