 | Edward Clarke Lowe - 1866 - 172 pages
...two straight lines to one another, which meet together, but are not in the same straight line. 10. When a straight line standing on another straight...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 - 424 pages
...[Definition 24. therefore the angle DCF is equal to the angle ECF; [I. 8. and they are adjacent angles. But when a straight line, standing on another straight...another, each of the angles is called a right angle ; ' [Definition 10. therefore each of the angles DCF, ECF is a right angle. Wherefore/row the given... | |
 | Euclid, Isaac Todhunter - Euclid's Elements - 1867 - 426 pages
...from the centre G ; [I. Definition 15. therefore the angle ADG is equal to the angle BDG. [I. 8. But when a straight line, standing on another straight...adjacent angles equal to one another, each of the angle's is called "a right angle ; [I. Definition 10. therefore the angle BDG is a right angle. But... | |
 | George Frederick Chambers - Astronomy - 1867 - 888 pages
...lines to each other in the same plane gives rise to a plant rectilineal angle, or simply an angle. When a straight line, standing on another straight line, makes the adjacent angles equal to each other, each of those angles is called a right angle; but if the adjacent angles are not equal... | |
 | Robert Potts - 1868 - 434 pages
...the angle AB D, or DBA ; and that which is contained by DB, CB, is called the angle DBG, or CBD. I When a straight line standing on another straight...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... | |
 | E. M. Reynolds - Geometry - 1868 - 172 pages
...placed between the other two. 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... | |
 | Isaac Todhunter - Measurement - 1869 - 312 pages
...statement that a certain angle is three times another angle, or four times another angle ; and so on. 8. When a straight line standing on another straight...and the straight line which stands on the other is called a perpendicular to it. Thus, in the figure, if the angle ABC is equal to the angle ABD each... | |
 | Euclides - 1870 - 270 pages
...360th part of the circumference of a circle, and consequently varies with the size of the circle. 10. When a straight line standing on another straight line makes the adjacent angles equal to each other, each of these angles is called a right angle; and the straight line which stands on the... | |
 | Euclides - 1871 - 136 pages
...the definition. IX. When a straight line (as AS) meeting another straight line (as CD) makes the A adjacent angles equal to one another, each of the angles is called a RIGHT ANGLE; and each line is said to be a PEEPENDICULAB to the other. c X. An OBTUSE ANGLE is one which is greater... | |
 | Isaac Sharpless - Geometry - 1879 - 282 pages
...DB, BO. If there be but one angle at a point, as at E, it may be designated simply as the angle E. 8. When a straight line standing on another straight line makes the adjacent angles equal to each other, each of them is called a right angle, and the straight line which stands on the other is... | |
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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. 
