| John Playfair - 1829 - 186 páginas
...one angle at a point, it may be expressed by a letter placed at that point, as -the angle at E. 10. **When a straight line standing on another straight line makes the adjacent angles equal to** each other, each of the angles is called a right angle; and the straight line which stands on the other... | |
| James Charlton - 1829 - 80 páginas
....,; . l 5tn"A f itei,*& i theinc!ination or opening -of two angles is called a RIGHT ANGLE ; and the **line which stands on the other, is called a PERPENDICULAR to it.** •• • > i •••••• i OF THE TERRESTRIAL •'CLdME.'"' 28. The TERRESTRIAL GLOBE is an... | |
| John Playfair - 1832 - 333 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** /• jii • • i j_ 1 / rr J f* i \ of the angles is a right angle (7. def. 1.) Therefore the aniile... | |
| Thomas Perronet Thompson - 1833 - 150 páginas
...equivalent. But whenever the contrary is not expressed, it is always the direct angle that is meant. XXXVII. **When a straight line standing on another straight...stands on the other is called a perpendicular to it** ; and is also said to be at right angles to it. XXXVIII. An angle greater than a right angle, is called... | |
| Euclid - 1833 - 183 páginas
...(ABC and ABD) equal to one another, each of these angles is called a right angle ; B and the right **line, which stands on the other, is called a perpendicular to it.** Fig. 1. 12. The angle (ABC), which is greater than a right angle, is called obtuse. Fig. 4. 13. The... | |
| Euclides - 1834
...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... | |
| 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... | |
| Euclid - 1835 - 513 páginas
...is equal" 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... | |
| 1836 - 472 páginas
...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...stands on the other is called a perpendicular to it.** 8. An obtuse angle is that which is greater than a right angle. 9. An acute angle is that which is... | |
| John Playfair - 1836 - 311 páginas
...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... | |
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