 | John Playfair - 1842 - 332 sider
...an* gle at a point, it may be expressed by a letter placed at that point ; as the 'angle at E.' 7. 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... | |
 | Euclides - 1842 - 316 sider
...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 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... | |
 | William Pease - 1843 - 80 sider
...that which is formed on the surface of a sphere, by the intersection of two of its great circles. 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 the... | |
 | Nicholas Tillinghast - 1844 - 110 sider
...straight line, as AB, meets another straight line, as CD, so as to make the adjacent angles, CAB, BAD, equal to each other, each of these angles is called a right angle, and the line AB is said to be perpendicular to CD. 7. Every angle less than a right angle is called... | |
 | Euclid - 1845 - 218 sider
...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 line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight tine which stands on the... | |
 | Scottish school-book assoc - 1845 - 444 sider
...» only one angle at the point, as at E, it may be called simply the »ngle at E, PLANE GEOMETRY. 9. 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 strnight line which stands on the... | |
 | Euclides - 1845 - 546 sider
...15.) therefore the angle FHC is equal to the angle GHC ; (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 them is a right angle, and the straight line which stands upon the other is called... | |
 | Euclid, John Playfair - 1846 - 334 sider
...an1 gle at a point, it may be expressed by a letter placed at that point ; as the ' angle at £.' 7. 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... | |
 | Euclides - 1846 - 292 sider
...EF— therefore (1. 8) the angle DCF is equal to the angle ECF ; 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 these angles is called a right angle (Def. 10) ; therefore each of the angles... | |
 | Euclides - 1847 - 128 sider
...length of the lines, by the meeting of which they are formed. See the Observation after Definition 18. 10. When a straight line, standing on another straight line, makes the adjacent an. gles equal to one another, each of the angles is called a right angle; and the straight line which... | |
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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. 
