 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.  Lessons on the delineation of form - Page 27by Charles Richson - 1848Full view - About this book
 | Euclides - 1864 - 448 pages
...15.) therefore the angle FHC is equal to the angle GHC; (I. 8.) and these are adjacent angles. But when a straight line standing on another 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... | |
 | Robert Potts - 1865 - 528 pages
...15.) therefore the angle FHC is equal to the angle GHC; (i. 8.) and these are adjacent angles. But when a straight line standing on another 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... | |
 | Euclides - 1865 - 402 pages
...angle at a point, it may be expressed by a letter placed at that point : as the angle at !•'.. 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... | |
 | Euclides - 1865 - 80 pages
...lines which meet in a point, called the vertex of an angle, and the two lines are called 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... | |
 | Walter Marsham Adams - 1866 - 114 pages
...is called a right angle, and we have this definition: •-AJ "When one straight line standing upon another straight line makes the adjacent angles equal...these angles is called a right angle, and the straight lines are said to be perpendicular to each other." And as the angle in a straight line was shown to... | |
 | 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 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... | |
 | 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...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 to each other, then... | |
 | 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 line, makes the adjacent angles equal to one another, each of the angle's is called "a right angle ; [I. Definition 10. therefore the angle... | |
 | 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 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... | |
 | 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... | |
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