| W. PEASE - 1846 - 86 pages
...of two of its great circles. When an angle is mentioned simply, it means a rectilineal angle. 23*. **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... | |
| Euclides - 1846 - 292 pages
...contained by DB, CB, is named the angle DBC or CBD: but, if there be only one angle at a point, it may ba **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... | |
| Great Britain. Admiralty - Geometry - 1846 - 130 pages
...contained by DB, CB, is called the angle DEC 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. angle; and the straight line which stands on the other, is called a perpendicular to it. XI.... | |
| John Playfair - Euclid's Elements - 1846 - 332 pages
...1 BD, CB, is called the angle DBC, or CBD ; but, if there be only one an1 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 - 1847 - 128 pages
...of the lines, by the meeting of which they are formed. See the Observation after Definition 18. 10. **When a straight line, standing on another straight line, makes the adjacent** an. gles equal to one another, each of the angles is called a right angle; and the straight line which... | |
| Euclides - 1848 - 52 pages
...inclination of two straight lines to one another, which meet together, but are not in the same straight line. **X. When a straight line standing on another straight line, makes the adjacent angles equal to** each other, each of these angles is called a right angle ; and the straight line which stands on the... | |
| Charles Richson - 1848 - 98 pages
...two straight lines to one another, which meet together, but are not in the same straight line." 2. **"When a straight line standing on another straight line makes the adjacent angles equal to** each other, each of these angles is called a right angle; and the straight line which stands on the... | |
| Euclid, Thomas Tate - 1849 - 120 pages
...one angle at a point, it may be expressed by a letter placed at that point; as the ;ingle at E." ' **x. 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... | |
| Elias Loomis - Conic sections - 1849 - 252 pages
...the angle ECD is the difference between the two angles BCD, BCE. 10. When a straight line, meeting **another straight line, makes the adjacent angles equal to one another, each of** them is called a right angle, and the straight line which meets the other is called a perpendicular... | |
| Janet Taylor - Nautical astronomy - 1851 - 702 pages
...points and quarter-points of the compass, cut off from the circle by the lines which form the angle. **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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