 | Robert Simson - Trigonometry - 1762 - 488 pages
...is called ' the angle DBC, or CBD. but if there be only one angle at a point, ' it may be exprefled by a letter placed at that point; as the angle ' at E.' X. When a ftraight line ftanding on another ftrailrht line makes the adjacent angles equal to one another,... | |
 | Euclid - 1781 - 552 pages
...CB is called the angle DBC, or CBD ; but, if there be only one angle at a point, it may be exprefled by a 'letter placed at that point; as the Angle at E.' .X. When a ftraight line flanding on another ftraight line makes the adjacent angles equal to one another,... | |
 | Euclid, John Playfair - Euclid's Elements - 1795 - 462 pages
...is caUed the angle DBC, or CBD ; but, ' if there be only one angle at a point, it ma^ be exprefled ' by a letter placed at that point ; as the angle at E.' VII. •/ f * When a ftraight line ftanding on another ftraight line makes the adjacent angles equal... | |
 | Robert Simson - Trigonometry - 1804 - 530 pages
...is called the angle DBC, or CBD. but « if there be only one angle at a point, it may be exprefled by a « letter placed at that point ; as the angle at E.' X. When a ftraight line flanding on another ftraight line makes the adjacent angles equal to one another,... | |
 | Robert Simson - Trigonometry - 1806 - 546 pages
...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. When a straight line standing on another straight lii>e makes the adjacent angles equal to one another,... | |
 | John Playfair - Mathematics - 1806 - 320 pages
...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.' VII. When a straight line standing on another straight line makes the adjacent angles equal to .one... | |
 | Euclid - Geometry - 1810 - 554 pages
...equal e to the angle CHG; and 1. they are adjacent angles; but when a straight line standing on ae 8. 1 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 Mason Good - 1813 - 714 pages
...two straight lines to or.e another, which meet together, but are not in the same straight line. 10. 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 - 1814 - 560 pages
...only one angle at a point, it may be ex' pressed by a letter 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... | |
 | Euclides - 1816 - 588 pages
...centre G*: Therefore the angle ADG is equal0 to the angle GDB : But when a straight line standing upon another straight line makes the adjacent angles equal to one another, each of the angles is a right angle d: Therefore the angle GDB is a right angle: MoDef. ' But FDB is likewise... | |
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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. 
