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. Stories about Mathematics-land - Page 73by D. Ponton - 1927Full view - About this book
| 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... | |
| 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
...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 a right... | |
| Euclid - Geometry - 1765 - 492 pages
...angle EH c [by prop. 8.] ; and thefe are adjacent angles. But when a right line flanding upon a right **line makes the adjacent angles equal to one another, each of the** equal angles is a right angle, and the ftanding right line is called a perpendicular to that upon which... | |
| Joseph Fenn - Mathematics - 1769 - 536 pages
...When a ftraight line (AB) {landing on another ftright line (CD) makes the adjacent angles (ABD, ABC,) **equal to one another, each of the angles is called a right angle ; and the** rtraight line (AB) which ftands on the other (CD) is called я perpendicular. Fig. 7. XI. An Obtvfe... | |
| Robert Simson - Trigonometry - 1775 - 534 pages
...is equal c to the angle GDB: But when a ftraight line ftanding upon another ftraight line makes .A. **the adjacent angles equal to one another, each of the angles is** a right angle d : Therefore the angle GDB is a " d to. def. i« right angle : But FDB is likewife a... | |
| Euclid, James Williamson - Euclid's Elements - 1781 - 324 pages
...8. i.) the angle AFE is equal to the angle BFE : but when a ftraight line ftanding upon a ftraight **line makes the adjacent 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 : therefore... | |
| Euclid - 1781 - 552 pages
...is equal e to the angle GDB : Buk when a ftraight line flanding upon another ftraight line makes A **the adjacent angles equal to one another, each of the angles is** a right an. J£ gled: Therefore the angle GDB is a * dio.def.r. Tight angle : But FDB is likewife a... | |
| Thomas Beddoes - Geometry - 1793 - 196 pages
...whether they are plane or otherwife. DEFINITION X, When a Jlfaight line ftanding on another Jiraight **line makes the adjacent angles equal to one another,...each of the angles is called a right angle, and the** line which Jlands on the other is called a perpendicular to it. Here we have an appeal made to the... | |
| Euclid, John Playfair - Euclid's Elements - 1795 - 462 pages
...the angle ADG is equal c. ,to the angle GDB : But when a ftraight line flanding upon another ftraight **line makes the adjacent angles equal to one another, each of the angles is** a right angle d. d7def.i. Therefore the angle GDB is a right angle : But FDB is .likewife a right angle... | |
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