 | Euclides - 1838 - 264 pages
...con'tained by DB.CB, is called the angle DBC, orCBD; 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.VIII. When a straight line standing on another straight line makes the adjacent angles equal to one... | |
 | Robert Simson - Geometry - 1838 - 434 pages
...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 - 208 pages
...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 - Geometry - 1841 - 378 pages
...one angle at a point, it may be ' expressed by a le:ter placed at that point; as the ' angle 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... | |
 | John Playfair - Euclid's Elements - 1842 - 332 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 E.' 7. When a straight line standing on another straight line makes the adjacent angles equal to one another,... | |
 | Euclides - 1842 - 316 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 E.' X. When a straight line standing on another straight line makes the adjacent angles equal to one another,... | |
 | William Pease - Geometry - 1843 - 80 pages
...' DB, CB, is called the angle DBG, 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.' 12. A Mixtilineal Angle is that which is contained by a right line and a curve. 13. A Spherical angle... | |
 | Scottish school-book assoc - 1845 - 444 pages
...» only one angle at the point, as at E, it may be called simply the »ngle at E, PLANE GEOMETRY. 9. 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 strnight line which stands on the other is called a perpendicular... | |
 | Euclides - 1845 - 546 pages
...be only one angle at a point, it may be expressed by the letter at that point; as the angle at /.'. 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 - Geometry - 1845 - 218 pages
...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.' X. When a straight line standing on another straight line makes the adjacent angles equal to one another,... | |
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When a straight line standing on another straight line makes 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 to it. 
