| Euclides - 1864 - 448 pages
...together, but are not in the same straight line. I) NB 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** : but when several angles are at one point B, either of them is expressed by three letters, of which... | |
| Euclides - 1865
...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... | |
| Robert Potts - 1865 - 528 pages
...together, but are not iii the same straight line. D XB 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** : but when several angles are at one point B, either of them is expressed by three letters, of which... | |
| Euclides - 1865 - 402 pages
...by DB, 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** !•'.. X. When a straight line standing on another straight line makes the adjacent angles equal to... | |
| William Harris JOHNSTON - 1865
...other angle between them, such as the angles ВАС and DA 0. When one straight line standing upon **another straight line makes the adjacent angles equal to one another, each** such angle is called a right angle, and either of the straight lines is said to be a perpendicular... | |
| 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... | |
| Euclid, Isaac Todhunter - Euclid's Elements - 1867 - 424 pages
...lines DB, CB is named 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.** 10. When a straight line standing on another straight line, makes the adjacent angles equal to one... | |
| Euclid, Isaac Todhunter - Euclid's Elements - 1867 - 426 pages
...lines DB, CB is named 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.** 10. When a straight line standing on another straight line, makes the adjacent angles equal to one... | |
| Robert Potts - 1868 - 410 pages
...together, but are not in the same straight line. g, NB 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** : but when several angles are at one point B, either of them is expressed by three letters, of which... | |
| 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...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... | |
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