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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 geometry; or, The first six books, with the eleventh and ... - Page 2
by Euclides - 1855
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Relfe brothers' Euclid sheets, propositions 1-26, book 1

Euclides - 1884 - 94 pages
...equal to the base ; therefore the angle is equal to the angle ; 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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An introduction to the Elements of Euclid, being a familiar explanation of ...

Stephen Thomas Hawtrey - 1884 - 184 pages
...leads on to the Definitions 10, 11, and 12 of Euclid, which are as follows : Definition 10.—When a straight line standing on another straight line...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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An introduction to geometry, consisting of Euclid's Elements, book ..., Volume 1

Euclides - 1884 - 182 pages
...angle in as many different ways as you can, and say how many. u •"- .° *• 6. KINDS OF ANGLES. 10. When a straight line standing on another straight line makes the adjacent angles equal to each other, each of these angles is called a right angle; and the straight line which stands on the...
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The Weston school manual

Colin Arrott R. Browning - 1884 - 274 pages
...angle is expressed by three letters, the middle letter is that which stands at the angular point. (4) When a straight line standing on another straight line makes the adjacent angles equal, each of them is called a Right Angle ; and the straight line standing on the other is called a Perpendicular,...
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Elementary Physiography: An Introduction to the Study of Nature

John Thornton - Physical geography - 1888 - 266 pages
...290. The Measurement of Angles. — Euclid gives the following definition of a right angle : — ' When a straight line standing on another straight...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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A Handbook of Descriptive and Practical Astronomy: Instruments and practical ...

George Frederick Chambers - Astronomical instruments - 1890 - 602 pages
...lines to each other in the same plane gives rise to a plant rectilineal angle, or simply on angle. When a straight line, standing on another straight line, makes the adjacent angles equal to each other, each of those angles is called a right angle ; but if the adjacent angles are not equal...
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The Harpur Euclid: An Edition of Euclid's Elements

Edward Mann Langley, W. Seys Phillips - 1890 - 538 pages
...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...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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Mathematics: Mechanic's bids and estimates. Mensuration for beginners. Easy ...

Seymour Eaton - 1899 - 362 pages
...lines to each other in a plane, which meet, but are not in the same straight line (A). MATHEMATTCS 8. When a straight line standing on another straight line makes the adjacent angles equal, each is called a right angle (B). The line which stands upon the other is called a perpendicular to...
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A Text-book of Euclid's Elements for the Use of Schools. Books I.-VI ..., Book 1

Euclid, Henry Sinclair Hall, Frederick Haller Stevens - Euclid's Elements - 1900 - 330 pages
...to be verticaIIy opposite. The two angles CEB, AED are also vertically opposite to one another. 10. When a straight line standing on another straight...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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Ellen: Or, Whisperings of an Old Pine, Volume 1

Joseph Battell - Force and energy - 1903 - 722 pages
...would be reasonably correct ; but in most respects not as accurate as that of Euclid, which reads : 'When a straight line standing on another straight...line makes the adjacent angles equal to one another, the angle is called a right angle ; and the straight line which stands on the other is called a perpendicular...
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