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
| Euclides - 1864 - 448 pages
...which is contained by lOB, CB, is called the angle DBC, or CBD. 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... | |
| Robert Potts - 1865 - 528 pages
...that which is contained by DB, CB, is called the angle DBC, or CBD, 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 liae which stands on the other ia called a... | |
| Euclides - 1865 - 402 pages
...equal to the angle ECF; (i. 8) 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** the angles is called a right angle ;' (def. 10) therefore each of the angles DCF, ECF, is a right angle.... | |
| Euclides - 1865
...its sides. 9. When a straight line standing on another straight line makes the adjacent angles equal, **each of them is called a RIGHT ANGLE; and the straight line which** stands upon the other is called a PERPENDICULAR to it. 10. An OBTUSE ANGLE is that which is greater... | |
| William Harris JOHNSTON - 1865
...other angle between them, such as the angles ВАС and DA 0. When one straight line standing upon **another straight line makes the adjacent angles equal to one another, each** such angle is called a right angle, and either of the straight lines is said to be a perpendicular... | |
| Edward Clarke Lowe - 1866
...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** these angles is called a right angle; and the straight line which stands on the other is & perpendicular... | |
| Euclid, Isaac Todhunter - Euclid's Elements - 1867 - 426 pages
...equal to the angle ECF; [I. 8. 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** the angles is called a right angle ; [Definition 10. therefore each of the angles DCF, ECF is a right... | |
| Robert Potts - 1868 - 410 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... | |
| E. M. Reynolds - Geometry - 1868 - 112 pages
...When an angle stands alone one letter only is often used, as A. When one 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 said to be... | |
| Septimus Tebay - Measurement - 1868 - 115 pages
...BA C. 8. When a straight line standing upon another straight line makes the adjacent angles equal, **each of them is called a right angle; and the straight line** standing upon the other is called a perpendicular. 9. An obtuse angle is greater than a right angle.... | |
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