 | Euclides - 1856 - 168 pages
...When a straight line standing on another straight line makes the adjacent angles equal to each other, each of the angles is called a right angle, and the...straight line which stands on the other is called perpendicular. PROPOSITIONS, i. Straight lines from the same point and in the same direction coincide.... | |
 | William Ezra Worthen - Architectural drawing - 1857 - 650 pages
...only one angle at a point, it may be expressed by a letter placed at that point ; as the angle at E.' When a straight line standing on another straight...angles is called a right angle ; and the straight lines are said to be perpendicular to each other (fig. 3). An obtuse angle is that which is greater... | |
 | W.E. WORTHEN - 1857 - 600 pages
...only one angle at a point, it may be expressed by a letter placed at that point; as the angle at E.' When a straight line standing on another straight...the angles is called a right angle; and the straight lines are said to be perpendicular to each other (fig. 3). An obtuse <mgle is that which is greater... | |
 | Euclides - 1858 - 248 pages
...line standing on another straight lino makes the adjacent angles equal to each other, each of these angles is called a right angle; and the straight line...stands on the other is called a perpendicular to it. The angle CD A being equal to angle CDB, each of them is a right angle, and CD is a perpendicular to... | |
 | Euclides - 1860 - 288 pages
...angle, and near to the angular point. Thus, angle DBC may be called angle n ; and ABD, angle m. 11. When a straight line standing on another straight...stands on the other is called a perpendicular to it. 12. The two adjacent angles which one straight line makes with another on the same side of it are called... | |
 | Robert Potts - Geometry, Plane - 1860 - 380 pages
...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...stands on the other is called a perpendicular to it. XL An obtuse angle is that which is greater than a right angle. XIL An acute angle is that which is... | |
 | William Schofield Binns - 1861 - 238 pages
...inclination of two straight lines to one another, meeting or cutting each other in a point, as c (10) " When a straight line standing on another straight...stands on the other is called a perpendicular to it." The angles AB c, ABD, are right angles. Obs. 1. Because DB is in the same straight line with B c, the... | |
 | Euclides - 1862 - 140 pages
...two straight lines to one another, which meet together, but are not in the same straight line. 10. When a straight line standing on another straight...stands on the other is called a perpendicular to it. 1 1 . An obtuse angle is that which is greater than a right angle. 13. A term or boundary is the extremity... | |
 | Euclides - 1863 - 74 pages
...line makes the adjacent angles equal to each other, each of these angles is called a right angle; D and the straight line which stands on the other is called a perpendicular to it. , The Anglo CDA being equal to angle CDB, each of them is a right angle, and CD is perpendicular toAB.... | |
 | Euclides - 1863 - 122 pages
...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 tbo other is called a perpendicular to it —!— XI. An obtuse angle is that which is greater than... | |
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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. 
