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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.
Euclid's Elements of plane geometry [book 1-6] explicitly enunciated, by J ... - Página 3
por Euclides - 1860
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## The first six books of the Elements of Euclid, with numerous exercises

Euclides - 1853 - 147 páginas
...the angle c hf is equal (i. 8) to the angle chg ; and they are adjacent angles ; but when (10 def.) a straight line standing on another straight line...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...
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## The geometry, by T. S. Davies. Conic sections, by Stephen Fenwick

...equal (8. i.) to the 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...
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## Orr's Circle of the Sciences: The mathematical sciences

William Somerville Orr - 1854
...straight line (AB) standing on another straight line (CD) makes the adjacent angles (А В С, А В D) equal to one another, each of the angles is called a right angle ; and the straight lines are said to be perpendicular to each other. Thus the two lines, AB, CD, are perpendicular to...
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## The Elements of geometry; or, The first six books, with the eleventh and ...

Euclides - 1855
...is put in inverted commas, as being Dr. Simson's addition ; it is very necessary to be remembered. X When a straight line standing on another straight...the adjacent angles equal to one another, each of these angles is called a right angle ; and the straight line which stands on the other is called a...
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## Mensuration of lines, areas, surfaces, and volumes

Robert Rawson - 1856
...only one angle at a point, it may be expressed by a letter placed at that point ; as the angle at E." When a straight line standing on another straight...stands on the other is called a perpendicular to it. XL An obtuse angle is that which is greater than a right angle. xn. An acute angle is that which is...
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## The geometry of the three first books of Euclid, by direct proof from ...

Euclides - 1856
...on the point of intersection between the straight lines or arms of the angle. XV. — RIGHT ANGLE. When a straight line standing on another straight line makes the adjacent angles equal to each other, each of the angles is called a right angle, and the straight line which stands on the other...
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## APPLETONS' CYCLOPAEDIA OF DRAWING

W.E. WORTHEN - 1857
...only one angle at a point, it may be expressed by a letter placed at that point; as the angle at E.' When a straight line standing on another straight...the angles is called a right angle; and the straight lines are said to be perpendicular to each other (fig. 3). An obtuse <mgle is that which is greater...
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## Appletons' Cyclopædia of Drawing: Designed as a Text-book for the Mechanic ...

William Ezra Worthen - 1857 - 410 páginas
...only one angle at a point, it may be expressed by a letter placed at that point ; as the angle at E.' When a straight line standing on another straight...angles is called a right angle ; and the straight lines are said to be perpendicular to each other (fig. 3). An obtuse angle is that which is greater...
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## Appletons' Cyclopædia of Drawing: Designed as a Text-book for the Mechanic ...

William Ezra Worthen - 1857 - 410 páginas
...only one angle at a point, it may be expressed by a letter placed at that point ; as the angle at E.' When a straight line standing on another straight...equal to one another, each of the angles is called a rig fit angle ; and the straight lines are said to be perpendicular to each other (fig. 3). An obtuse...
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## Gradations in Euclid : books i. and ii., with an explanatory preface [&c ...

Euclides - 1858
...line standing on another straight lino makes the adjacent angles equal to each other, each of these angles is called a right angle; and the straight line...stands on the other is called a perpendicular to it. The angle CD A being equal to angle CDB, each of them is a right angle, and CD is a perpendicular to...
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