 | Euclid - 1845 - 218 pàgines
...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...the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight tine which stands on the other is called a perpendicular... | |
 | Euclides - 1845 - 546 pàgines
...be only one angle at a point, it may be expressed by the letter at that point; as the angle at /.'. 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... | |
 | Euclid, John Playfair - 1846 - 334 pàgines
...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...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... | |
 | Euclides - 1846 - 292 pàgines
...BE — therefore the angle AFE is equal to the angle BFE : But when a straight line, standing upon another straight line, makes the adjacent angles equal to one another, each of them is a right angle ; therefore each of the angles AFE, BFE is a right angle ; and therefore the... | |
 | Euclides - 1847 - 128 pàgines
...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... | |
 | Euclides - 1848 - 52 pàgines
...of two straight lines to one another, which meet together, but are not in the same straight line. X. 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... | |
 | Charles Richson - 1848 - 98 pàgines
...two straight lines to one another, which meet together, but are not in the same straight line." 2. "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... | |
 | Euclid, Thomas Tate - 1849 - 120 pàgines
...one angle at a point, it may be expressed by a letter placed at that point; as the ;ingle at E." ' x. 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... | |
 | Elias Loomis - 1849 - 252 pàgines
...the angle ECD is the difference between the two angles BCD, BCE. 10. When a straight line, meeting another straight line, makes the adjacent angles equal to one another, each of them is called a right angle, and the straight line which meets the other is called a perpendicular... | |
 | Janet Taylor - 1851 - 674 pàgines
...points and quarter-points of the compass, cut off from the circle by the lines which form the 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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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. 
