| Euclid, James Thomson - 1845 - 352 pągines
...line standing on another makes the adjacent angles equal, each of the angles is called a right ample; **and the straight line which stands on the other is called a perpendicular to it,** and is said to be at right angles to it. 9. An obtuse angle is that which is greater than a right angle.... | |
| Euclides - 1845
...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 - 1845 - 199 pągines
...§ II is Def. to the angle CHG; and they are adjacent angles; but when a straight line standing on a **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 a perpendicular... | |
| Euclides - 1846
...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...the adjacent angles equal to one another, each of** these angles is called a right angle (Def. 10) ; therefore each of the angles DCF, ECF is a right angle... | |
| Great Britain. Admiralty - 1846
...The extremities of a superficies are lines. VII. A plane superficies is that in which any two «r C **angle; and the straight line which stands on the other, is called a perpendicular to it.** XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which... | |
| Great Britain. Admiralty - 1846
...only one angle at a point, it may be expressed by a letter placed at that point, as the angle at E. X. **angle; and the straight line which stands on the other, is called a perpendicular to it.** XI. An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which... | |
| John Playfair - 1846 - 317 pągines
...equal (8. 1.) to the angle CHG ; and they are adjacent angles ; now when a straight line standing on a **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 a perpendicular... | |
| Euclides - 1847
...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... | |
| Charles Richson - 1848
...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... | |
| Euclides - 1848
...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... | |
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