| Ralph Smyth, Sir Henry Edward Landor Thuillier - Surveying - 1851 - 828 pages
...another, which meet together, but are not in the same straight line.* 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... | |
| Euclides - 1852
...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."** [Observe that BAC is a greater angle than DEF, because the inclination of BA to AC is greater than... | |
| Euclides - Geometry - 1853 - 176 pages
...С b, is called the angle db С, ог С bd ; 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 adjacent angles equal to one another,... | |
| Euclides - 1853 - 146 pages
...contained by SB, 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 adjacent angles equal to one another,... | |
| Royal Military Academy, Woolwich - Mathematics - 1853
...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 E.** 10. When a straight line standing on another straight line makes the adjacent angles equal to one another,... | |
| John Playfair - Geometry - 1855 - 336 pages
...' BD, CB, is called the angle DBC, or CBD ; but, if there be only one an' gle at a point, it may be **expressed by a letter placed at that point; as the ' angle at** £.' 7. When a straight line standing on another straight line makes the adjacent angles equal to one... | |
| Euclides - 1856
...on the point of intersection between the straight lines or arms of the angle. XV. — RIGHT ANGLE. **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... | |
| Robert Rawson - 1856
...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 E."** When a straight line standing on another straight line makes the adjacent angles equal to one another,... | |
| William Ezra Worthen - Architectural drawing - 1857 - 410 pages
...only one angle at a point, it may be expressed by a letter placed at that point ; as the angle at E.' **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 lines are said to be perpendicular to each other... | |
| W.E. WORTHEN - 1857 - 600 pages
...lines, AB, CB, is named the angle ABO, or CBA; 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.'** When a straight line standing on another straight line makes the adjacent angles equal to one another,... | |
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