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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. "
A course of geometrical drawing - Page 2
by William Schofield Binns - 1861
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The synoptical Euclid; being the first four books of Euclid's Elements of ...

Euclides - 1853 - 146 pages
...one angle at a point, it may be expressed 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...
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The first six books of the Elements of Euclid, with numerous exercises

Euclides - 1853 - 176 pages
...another straight line makes the adjacent angles equal to one another, each of the angles is called a rigM angle ; and the straight line which stands on the other is called a perpendicular toit. XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that...
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The Elements of geometry; or, The first six books, with the eleventh and ...

Euclides - 1855 - 262 pages
...line standing on another straight line makes the adjacent angles equal to one another, each of these angles is called a right angle ; and the straight...stands on the other is called a perpendicular to it. By borrowing the terms vertical and horizontal from the language of Physics, we may define a right...
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Mensuration of lines, areas, surfaces, and volumes

Robert Rawson - 1856 - 200 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
...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 is called perpendicular. PROPOSITIONS, i. Straight lines from the same point and in the same direction coincide....
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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...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 A...
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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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Euclid's Elements of Geometry: Chiefly from the Text of Dr. Simson, with ...

Robert Potts - Geometry, Plane - 1860 - 380 pages
...line standing on another straight line, makes the adjacent angles equal to one another, each of these angles is called a right angle ; and the straight...stands on the other is called a perpendicular to it. XL An obtuse angle is that which is greater than a right angle. XIL An acute angle is that which is...
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Euclid's plane geometry, books iii.-vi., practically applied; or, Gradations ...

Euclides - 1861 - 464 pages
...st. line makes the adj. _s equal to each other, each of these /.s is called a rt. _ ; and the st. line which stands on the other is called a perpendicular to it. Ax. 1. Things which are equal to the same thing are equal to one another. EI 2 CI 2 Dat. Quass. Pst....
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Euclid's Elements of geometry, books i. ii. iii. iv

Euclides - 1862 - 140 pages
...inclination of two straight lines to one 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. 1 1 . An obtuse angle is that which is greater than a right angle. 13. A term or boundary is the extremity...
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