 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 and Conic Sections - Page 10by Elias Loomis - 1849 - 226 pagesFull view - About this book
 | Encyclopedias and dictionaries - 1896 - 824 pages
...upon another straight line make о Fig. 5. the two adjacent angles (those on the right and left of it) equal to one another, each of them is called a right angle. An oblique angle is one which is not a right angle. An obtuse angle Is that which is greater than one... | |
 | Seymour Eaton - 1899 - 362 pages
...the angle ECF (Proposition 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 (Definition 8) ; therefore each of the angles DCF and ECF is a... | |
 | Euclid, Henry Sinclair Hall, Frederick Haller Stevens - Euclid's Elements - 1900 - 330 pages
...two angles CEB, AED are also vertically opposite to one another. 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 other is called a perpendicular... | |
 | Euclid - Euclid's Elements - 1904 - 488 pages
...two angles CEB, AED are also vertically opposite to one another. 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 other is called a perpendicular... | |
 | Charles Westinghouse - Machine design - 1906 - 168 pages
...meet together, but are not in the same straight line as in Fig. 34. 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... | |
 | Joseph H. Rose - Sheet-metal work - 1906 - 340 pages
...but are not in the same straight line as in Fig. 1. Fig. 1. Fig. 2. 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... | |
 | Calvin Franklin Swingle - Engineering - 1906 - 490 pages
...are not in the same straight line as in Fig. 34. Fi(. 34. Fig 35. 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... | |
 | Euclid - Mathematics, Greek - 1908 - 550 pages
...containing the angle are straight, the angle is called rectilineal. 10. 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... | |
 | Henry John Spooner - Geometrical drawing - 1911 - 196 pages
...straight line standing on another straight line makes the adjacent angles (those on each side of it) equal to one another, each of them is called a right angle ; and the lines are mutually perpendicular, and are inclined to one another at an angle of 90° (Fig. 554). An... | |
 | David Eugene Smith - Geometry - 1911 - 370 pages
...therefore confine our attention to having the concept understood. 10. 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... | |
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