 | Marcius Willson - Object-teaching - 1863 - 356 pages
...some other line. Thus a straight line is perpendicular to another straight line when it makes the two adjacent angles equal to one another. Each of these angles is called a right angle (see Chart). But if two straight lines meet each other so as to make but one right angle, each is said,... | |
 | Euclides - 1863 - 122 pages
...is equal (I. 8) to the angle GDB. But when a straight line standing upon another straight line makes the adjacent angles equal to one another, each of these angles is a right angle (I. Def. 10). Therefore the angle GDB is a right angle. But FDB is likewise (Oemsi.)... | |
 | Euclides - 1864 - 262 pages
...CB, is called the angle DEC, 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 perpendicular to it. XI. An obtuse angle is that... | |
 | Euclides - 1864 - 448 pages
...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 perpendicular to it. XL An obtuse angle is that... | |
 | Robert Potts - 1865 - 528 pages
...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 perpendicular to it. XI. An obtuse angle is that... | |
 | Edward Clarke Lowe - 1866 - 172 pages
...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 to it. 11. An obtuse angle is that which... | |
 | E. M. Reynolds - Geometry - 1868 - 172 pages
...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 perpendicular to it. We acquire a clear idea... | |
 | Robert Potts - 1868 - 434 pages
...CB, is called the angle DBG, or CBD. I 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 perpendicular to it. XL An obtuse angle is that... | |
 | John Clement P. Aldous - 1874 - 104 pages
...by which angles may be measured. DBF. When one straight line standing on another straight line makes the adjacent angles equal to one another, each of these angles is called a Bight Angle. Now all right angles are equal to one another. So that any angle may be measured by them.... | |
 | Henry Lewis (M.A.) - Measurement - 1875 - 104 pages
...little too difficult for beginners: — 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. An acute angle is less than a right angle, as ABD, DEE. An obtuse angle is greater than a right angle,... | |
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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 perpendicular to it. 
