| Euclides - 1834 - 518 pages
...the base CG: therefore the angle CHF is equal* to the angle CHG ; and they are adjacent angles: but **when a straight line, standing on another straight...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 a perpendicular... | |
| Euclid - 1835 - 540 pages
...contained by BD, CB is called the angle DBC, or CBD : but if there be only one angle at a point, it may be **expressed by a letter placed at that point ; as the angle at E.'** X. When a straight line standing on another straight line makes the adja- • cent angles equal to... | |
| Mathematics - 1835
...letter, as A, always denotes the angular point. 10. (Eue. i. det 10.) When a straight line standing; upon **another straight line makes the adjacent angles equal to one another, each of** them is called a right angle, and the straight line which stands upon the other is called a perpendicular... | |
| Mathematics - 1836 - 472 pages
...of two straight lines to one another, which meet together but are not in the same straight line. 7. **When a straight line standing on another straight...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... | |
| John Playfair - Euclid's Elements - 1836 - 488 pages
...angle at a point, it may be expressed by a letter placed ' at that point ; as the angle at E.' VII. **When a straight line standing on another straight line makes the adjacent angles equal to one** an, other, each of the angles is called a right angle; and the straight line which stands on the other... | |
| John Playfair - Geometry - 1836 - 114 pages
...therefore the angle ADG is equal (7. 1.) to the angle BDG ; 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 (Def. 27. 1.); therefore BDG is a right angle ; but BDF is likewise a right... | |
| Euclid - Geometry - 1837 - 410 pages
...meet one another.^ The point in which the straight lines meet is called the vertex of the angle. 8. **When a straight line standing on another straight...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... | |
| Andrew Bell - Euclid's Elements - 1837 - 240 pages
...contained by BD, CB, is called the angle DBG, or CBD ; but if there be only one angle at a point, it may be **expressed by a letter placed at that point ; as the angle at E.** It is sometimes convenient to name an angle by a small letter placed within the angle ; thus, angle... | |
| Charles Reiner - Geometry - 1837 - 246 pages
...lines which contain the angle are called its legs. 9. Angles may either be equal or unequal. 10. If one **straight line standing on another straight line makes the adjacent angles equal to** each other, each of them is called a right angle. 11. All right angles are equal to each other. 12.... | |
| John Playfair - Geometry - 1837 - 332 pages
...therefore the angle ADG is equal (8. 1.) to the angle GDB : 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 (7. def. i .) Therefore the angle GDB is a right angle : But FDB is likewise... | |
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