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" When a straight line set up on a straight line makes the adjacent angles equal to one another, each of the equal angles is right, and the straight line standing on the other is called a perpendicular to that on which it stands. "
Introduction and books 1,2 - Page 181
by Euclid, Sir Thomas Little Heath, Johan Ludvig Heiberg - 1908
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Primer of geometry

Francis Cuthbertson (geometer.) - 1876
...if two straight lines &c. QED RIGHT ANGLES. DEFINITION. When one straight line, standing on another straight line, makes the adjacent angles equal to one another, each of them is called a right angle ; and the straight line which stands upon the other is - said to be perpendicular...
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Modern geometry [ed.] with an appendix by W.B. Jack

Richard Wormell - 1876
...vertex, and are on opposite sides of a common side. 1 8. When one straight 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 line which stands on the other is said to be...
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Euclid's Elements of Geometry: Chiefly from the Text of Dr. Simson, with ...

Robert Potts, Thomas Kirkland - Geometry, Plane - 1876 - 403 pages
...is contained by DB. CB, is called the angle DBC, or CUD. X. When a straight 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 line which stands on the other is called a...
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A Military Dictionary: Comprising Terms, Scientific and Otherwise, Connected ...

G. de Saint-Clair-Stevenson - English language - 1876 - 581 pages
...substantive rank (viile Rank) in the army. Perpendicular When a straight line standing on another straight line makes the adjacent angles equal to one another, each of these angles is a right angle, and the line perpendicular. Persian Wheel A contrivance for raising...
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Natural Philosophy for Beginners: With Numerous Examples, Part 1

Isaac Todhunter - Philosophy - 1877
...This is put into a more precise form in the following manner: 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...
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Elements of geometry, based on Euclid, Book 1

Edward Atkins - 1877
...the angle ECP (I. 8) ; And they 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 (Dcf. 10); Hake CK = CD ami A DF.F cquihiteiul. '. DCF = '! F.Cf. 20...
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Euclid, book i., propositions i. to xxvi., with exercises and alternative ...

Euclides - 1877
...leave it uncertain which of the three angles was intended. 9. When a straight 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 line which stands on the other is said to be...
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The elements of plane geometry, from the Sansk. text of Ayra Bhatta, ed. by ...

Āryabhaṭa - 1878
...an angle and is thus expressed : " Angle AB 0." A BC XVI. When a straight 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 line which stands on the other is called a...
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Moffatt's pupil teachers' course (ed. by T. Page). Candidates, 2nd (-4th) year

Moffatt and Paige - 1879
...to the angle ECF (I. 8), 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 these angles is called a right angle (Def. 10). Therefore each of the angles DCF, ECF is a right angle,...
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Explanatory Mensuration

Alfred Hiley - 1879 - 188 pages
...AC, but upon the extent or opening between the lines. XI. When a straight line standing upon another straight line makes the adjacent angles equal to one another, each of them is called a right A angle ; and the straight line standing upon the other is called a perpendicular...
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