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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 Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ... - Side 2
av Robert Simson - 1781 - 466 sider
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Class lessons on Euclid

Marianne Nops - 1882
...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...
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Geometry for schools, comprising books i. and ii. of Euclid, with some ...

Euclides - 1883 - 96 sider
...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...
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The Elements of Euclid for the Use of Schools and Colleges: Comprising the ...

Euclid, Isaac Todhunter - 1883 - 400 sider
...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...
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Stewart's specific subjects. Euclid. [1st] (-3rd stage). [With 2 issues of ...

Stewart W. and co - 1884
...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...
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The Living Age ..., Volum 161

1884
...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...
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Elementary Physiography: An Introduction to the Study of Nature

John Thornton - 1888 - 248 sider
...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...
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The Harpur Euclid: An Edition of Euclid's Elements

Edward Mann Langley, W. Seys Phillips - 1890 - 515 sider
...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...
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Imperial Reference Library: Comprising a General Encylopædia ...

1898
...6m, is named the angle с m Ъ. — When a straight line, cm, standing on another straight line, a b. makes the adjacent angles equal to one another, each of the angles erne, cmb, is culled a right anglr; and the straight lines are said to be perpendicular to each other....
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A Text-book of Euclid's Elements for the Use of Schools, Books I.-IV., Bok 1

Henry Sinclair Hall, Frederick Haller Stevens - 1900 - 304 sider
...are also vertically opposite to one another. 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. 1 1 . An obtuse angle is an...
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A Text-book of Euclid's Elements for the Use of Schools, Bok 1

Euclid - 1904 - 456 sider
...are also vertically opposite to one another. 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. 1 1 . An obtuse angle is an...
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