 | John Keill - Logarithms - 1723 - 444 pages
...the Angle AFE j. g ti fhall bef equal to the Angle BFE. But when a Right Line {landing upon a Right Line makes the adjacent Angles equal to one another, each of the equal Angles is ia Right Angle. Wherefore AFE, or BFE, is a Right Angle. And therefore the Right Line CD drawn thro*... | |
 | Euclid, John Keill - Geometry - 1733 - 444 pages
...Therefore the Angle * 8- i. AD G is * equal to the Angle GD B. But when a Right Line ftanding upon 'a Right Line, makes the adjacent Angles equal to one another, each of the 10. i. equal Angles will f be a Right Angle. Wherefore the Angle GDB is a Right Angle. But FDB is alfo... | |
 | Robert Simson - Trigonometry - 1762 - 488 pages
...therefore the angle ADG is equal c to the angle GDB. but when a ftraight line ftanding upon another ftraight line, makes the adjacent angles equal to one another ,each of the angles is a right angle *. therefore the angle GDB is a right angle. but FDB is like- d.io.Def.i. wife... | |
 | Euclid - Geometry - 1765 - 492 pages
...will be equal to the angle BFE. But fmce a right line flanding upon a right line makes the adjoining angles equal to one another, each of the equal angles is a right angle : therefore each of the angles AFE, BFE is a right angle, and fo the right line c D drawn thro' A\... | |
 | John Keill - Geometry - 1772 - 462 pages
...the Angle AFE fliall be f equal to the Angle BFE. But when af 8. t. Right Line Standing upon a Right Line makes the adjacent Angles equal to one another, each of the equal Angles is J a Right Angle. Wherefore AFE, orJ0«/. 10. i« BFE, is a Right Angle. And therefore the Right •Line... | |
 | Robert Simson - Trigonometry - 1775 - 534 pages
...is equal' to the angle CHG; and they are adjacent angles ; but when a ftraight line ftanding cet on a ftraight line makes the adjacent angles equal to one another, each of them is a right angle, and the ftraight line which flands upon the other is called a perpendicular... | |
 | Robert Simson - Trigonometry - 1781 - 534 pages
...equal e to the angle CHG; and they are adjacentc. 8. i. angles. but when a ftraight line ftanding on a ftraight line makes the adjacent angles equal to one another, each of them is aright angle, and the ftraight linewhich ftands upon the other is called a perpendiculartoit.... | |
 | Euclid - 1781 - 552 pages
...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, each of the angles is called a right angle ; and the ftraight line which ftands on the other is called a perpendicular... | |
 | John Keill - Geometry - 1782 - 476 pages
...Therefore the Angle ADG is * equal to the Angle GD B. But when 3*8.,. Right Line ftandmg upon a Right Line makes the adjacent Angles equal to one another, each of the equal Angles will f be a Right Angle. Wherefore fZ?»/.io.» F the the Angle GDB is a Right Angle. But FDB is alfo... | |
 | Proclus (Diadochus.) - 1788 - 350 pages
...divided. DKFINITION X. When a Right Line Handing on a Right Line, makes the fucceffive Angles on each fide equal to one another, each of the equal Angles, is a Right Angle ; and the infifting Right Line, is called a PERPENDICULAR to that upon which it ftands. DEFINITION Xf. An OBTUSE... | |
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When a straight line set up on a straight line makes the adjacent angles equal to one another, each of the equal angles is right, and the straight line standing on the other is called a perpendicular to that on which it stands. 
