 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.  Pure mathematics - Page 103by Edward Atkins - 1874Full view - About this book
 | Euclides - 1863 - 122 pages
...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 tbo other is called a perpendicular to it —!— XI. An obtuse angle is that which is greater than... | |
 | Euclides - 1864 - 262 pages
...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...stands on the other is called a perpendicular to it. XI. An obtuse angle is that which is greater than a right angle. xn. An acute angle is that which is... | |
 | Euclides - 1864 - 448 pages
...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 a right... | |
 | Euclides - 1865 - 402 pages
...(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. Wherefore, from the point C,... | |
 | Robert Potts - 1865 - 528 pages
...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 a right... | |
 | Edward Clarke Lowe - 1866 - 172 pages
...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 to it. 11. An obtuse angle is that which is greater than a right angle. 12. An acute... | |
 | Euclid, Isaac Todhunter - Euclid's Elements - 1867 - 424 pages
...ADG is equal to the angle BDG. [I. 8. 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 ; [I. Definition 10. therefore the angle BDG is a right angle. But the angle BDF is also a right angle.... | |
 | Euclid, Isaac Todhunter - Euclid's Elements - 1867 - 426 pages
...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 angle. Wherefore/rom the given point... | |
 | E. M. Reynolds - Geometry - 1868 - 172 pages
...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 perpendicular to it. We acquire a clear idea of'the magnitude of an angle by supposing it... | |
 | Robert Potts - 1868 - 434 pages
...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 a right... | |
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