 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 Weston school manual - Page 31by Colin Arrott R. Browning - 1884Full view - About this book
 | Euclides - 1884 - 214 pages
...together equal to two right angles. Axiom 1. Therefore, the angles which &o. QE Ti. Definition 10. 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. Proposition XL A straight -line may be... | |
 | 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 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... | |
 | Stewart W. and co - 1884 - 272 pages
...but are not in the same straight line. An angle is named from three or one letters, as ABC or B. X. 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... | |
 | 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... | |
 | 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 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... | |
 | Mathematics - 1885 - 150 pages
...to one another." This again is capable of proof. The definition of a right angle is as follows : " 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... | |
 | W. J. C. Miller - Mathematics - 1885 - 154 pages
...to one another." This again is capable of proof. The definition of a right angle is as follows : ' ' 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... | |
 | 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 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... | |
 | George William Usill - Surveying - 1889 - 306 pages
...When an angle is simply spoken of, a plane rectilineal angle is always meant. 4. Perpendicular, — 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 lines are said to be... | |
 | 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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