| John Playfair - 1836 - 114 páginas
...equal (7. 1.) to the angle CHG, and they are adjacent angles ; but when a straight line, standing on a **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 a perpendicular... | |
| Euclid, James Thomson - 1837 - 390 páginas
...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...stands on the other is called a perpendicular to it,** and is said to be at right angles to it. 9. An obtuse angle is that / which is greater than a right... | |
| James Thomson (LL.D.) - 1837 - 284 páginas
...When one straight line standing on another, makes with it two angles which are equal, each of these **angles is called a RIGHT ANGLE ; and the straight line which stands on the other is** said to be PERPENDICULAR, Or AT RIGHT ANGLES, tO it, or tO be a PERPENDICULAR to it. III. An OBTUSE... | |
| John Playfair - 1837 - 318 páginas
...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 a right... | |
| Charles Reiner - 1837 - 215 páginas
...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.... | |
| Euclides - 1838
...EB; therefore the angle AFE is equal* *si to the angle BFE: but when a straight line standing upon **another straight line makes the adjacent angles equal to one another, each** *s Def.i. of u,,,,,, is a right« angle. there_ fore each of the angles AFE, BFE, is a right angle:... | |
| Euclid, Robert Simson - 1838 - 416 páginas
...equal (8. 1.) to the angle CHG; and they are adjacent angles ; but when a straight line standing on a **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 a perpendicular... | |
| John Clark (drawing master.) - 1840
...way. Vertical or Perpendicular Lines are those which are drawn perfectly upright. When a straight une **standing on another straight line makes the adjacent angles equal to one another,** then the upright une which stands on the other is called a perpendicular to it. The drawing of a perpendicular... | |
| Euclides - 1841 - 351 páginas
...base CG; * 3. 1. 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... | |
| Euclides - 1842
...therefore the angle c HF is equal (8. 1.) to the angle c н G ; 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... | |
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