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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.
Elements of Geometry: Containing the First Six Books of Euclid: With a ... - Page 18
by John Playfair - 1819 - 317 pages
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Mensuration of Lines, Areas, Surfaces, and Volumes ...

Robert Rawson - 1856 - 178 pages
...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 - 168 pages
...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 - 600 pages
...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' Cyclopędia of Drawing: Designed as a Text ..., Page 80, Issue 4676

William Ezra Worthen - Architectural drawing - 1857 - 650 pages
...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' Cyclopędia of Drawing: Designed as a Text ..., Page 80, Issue 4676

William Ezra Worthen - Architectural drawing - 1857 - 632 pages
...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 - 248 pages
...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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Elements of Geometry and Conic Sections

Elias Loomis - Conic sections - 1858 - 256 pages
...the angle ECD is the difference between the two angles BCD, BCE. 10. When a straight line, meeting another straight line, makes the adjacent angles equal to one another, each of them is called a right angle, and the straight line which meets the other is called a perpendicular...
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Euclid's Elements of plane geometry [book 1-6] explicitly enunciated, by J ...

Euclides - 1860 - 288 pages
...angle, and near to the angular point. Thus, angle DBC may be called angle n ; and ABD, angle m. 11. When a straight line standing on another straight...stands on the other is called a perpendicular to it. 12. The two adjacent angles which one straight line makes with another on the same side of it are called...
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The popular educator, Volume 3

Popular educator - 1860 - 536 pages
...equal to the base OH, and the angle CHF (I. 4) to the angle CBO ; and they are adjacent angles. But when a straight line standing on another straight...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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Euclid's Elements of Geometry: Chiefly from the Text of Dr. Simson, with ...

Robert Potts - Geometry, Plane - 1860 - 380 pages
...15.) therefore the angle FHC is equal to the angle GHC; (I. 8.) and these are adjacent angles. But when a straight line standing on another straight...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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