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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.
The First Six Books: Together with the Eleventh and Twelfth - Σελίδα 10
των Euclid - 1781 - 520 σελίδες
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## Moffatt's pupil teachers' course (ed. by T. Page). Candidates, 2nd (-4th) year

Moffatt and Paige - 1879 - 426 σελίδες
...one letter at that point, as the angle at E. 10. 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. n. An obtuse angle is that...

## First principles of Euclid: an introduction to the study of the first book ...

T S. Taylor - 1880 - 152 σελίδες
...DEFINITION OF RIGHT ANGLES. JTigr.J. Euc. Def. io.) — 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 -A. -0 .* said to be perpendicular to it. Thus the straight...

## The Elements of Euclid for the Use of Schools and Colleges: With Notes, an ...

Isaac Todhunter - 1880 - 426 σελίδες
...angle A FE is equal to the angle BFE. [I. 8. But 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 ; [I. Definition 10. therefore each of the angles A FE, BFE is a right angle. Therefore the straight...

## Class lessons on Euclid

Marianne Nops - 1882 - 278 σελίδες
...sharp). These are thus defined by Euclid : — 10. ' 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.' 11. 'An obtuse angle is that...

## The Elements of Euclid for the Use of Schools and Colleges: Comprising the ...

Euclid, Isaac Todhunter - 1883 - 428 σελίδες
...angle AFE is equal to the angle BFE. [I. 8. But 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 ; [I. Definition 10. therefore each of the angles AFE, BFE is a right angle. Therefore the straight...

## Geometry for schools, comprising books i. and ii. of Euclid, with some ...

Euclides - 1883 - 176 σελίδες
...L DCF = L ECF, and these are adjacent angles. But 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. .-. CF is at right angles to AB, and is drawn from the given point CQEF NSte.— Since an angle may...

## Stewart's specific subjects. Euclid. [1st] (-3rd stage). [With 2 issues of ...

Stewart W. and co - 1884 - 272 σελίδες
...named from three or one letters, as ABC or B. X. 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. XI. An obtuse angle is greater...

## Littell's Living Age, Τόμος 161

1884 - 860 σελίδες
...same straight line [plane]. X. When a straight line [plane] standing on another straight line [plane] makes the adjacent angles equal to one another, each of the angles is called a right angle [right dihedral angle]. XV. A circle [cone of revolution with vertex at the eye] is a figure contained...

## Elementary Physiography: An Introduction to the Study of Nature

John Thornton - 1888 - 266 σελίδες
...the following definition of a right angle : — ' 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.' We find it convenient for...

## The Harpur Euclid: An Edition of Euclid's Elements

Edward Mann Langley, W. Seys Phillips - 1890 - 538 σελίδες
...instead of it. See Note 2 on Prop. 9. DEF. 10. — 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 said to be perpendicular, or at right angles, to it. The...