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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.
Geometry Without Axioms; Or the First Book of Euclid's Elements. With ... - Σελίδα 51
των Thomas Perronet Thompson - 1833 - 150 σελίδες
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## The Elements of Euclid: Viz. the First Six Books, with the Eleventh and ...

Alexander Ingram - 1799 - 351 σελίδες
...* : Therefore the angle ADG is equal 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 : Therefore the angle GDB is a right angle : But FDB is likewife a right angle ; wherefore...

## The Elements of Euclid: Also the Book of Euclid's Data ...cor. viz. The ...

Robert Simson - 1804
...the angle ADG is equal c to the angle GDB. but when a ftraight A line (landing upon another ftraight 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. but FDB is ' likewife a right angle ; wherefore...

## The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclid, Robert Simson - 1806 - 518 σελίδες
...G * : therefore the angle ADG is equal c 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: but FDB is likewise a '" right angle; wherefore...

## Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - 1806 - 311 σελίδες
...equald to the d 8. 1. 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...

## The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclid - 1810 - 518 σελίδες
...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...

## Pantologia. A new (cabinet) cyclopædia, by J.M. Good, O. Gregory ..., Τόμος 5

John Mason Good - 1813
...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...stands on the other is called a perpendicular to it. 11. An obtuse an¿le is that which is greater 'than a right angle. IS. An acnte angle is that which...

## The Elements of Euclid; viz. the first six books, together with the eleventh ...

Euclides - 1814
...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...stands on the other is called a perpendicular to it. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which...

## The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclides - 1816 - 528 σελίδες
...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 a right antrle...

## Encyclopaedia Perthensis; Or Universal Dictionary of the Arts ..., Τόμος 10

1816
...Tig JSg*. >%.?• rijr.21 / \ V_^ X' %!1^-^ %V28. !%• 32>^c » BHEA 11 l%.ll . Fig:a3. Fl ftraight line makes the adjacent angles equal to one another, each of the angles is called a KICHT ANGL.F and the ftraight line which (rands on the other u oiled a PEKPFXDICI'LAR. Fig. 4. 8. An...

## Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - 1819 - 333 σελίδες
...therefore the angle ADG is equal (8. 1.) to the angle GDB : Bat 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 (7. def. 1.). Therefore the angle GDB is a right angle: But FDB is likewise a right angle...