 | John Playfair - Mathematics - 1806 - 320 pages
...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. _____ VIII, Book I. An obtuse angle is that which is greater than a right... | |
 | Robert Simson - Trigonometry - 1806 - 546 pages
...line standing on another straight lii>e 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. XI. An obtuse angle is that which is greater than a right angle. XII.... | |
 | John Mason Good - 1813 - 714 pages
...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. 11. An obtuse an¿le is that which is greater 'than a right angle. IS.... | |
 | John Playfair - Circle-squaring - 1819 - 350 pages
...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. VIII. An obtuse angle is that which is greater than a right angle. An... | |
 | Adrien Marie Legendre - Geometry - 1819 - 574 pages
...line AB (Jig. 3) meets another straight line CD in such a manner that the adjacent angles BAC, BAD, are equal, each of these angles is called a right angle, and the line .III is said to be perpendicular to CD. Fig- 4. ii. Every Shgle BJiC (Jig. 4), less than a right... | |
 | Peter Nicholson - Mathematics - 1825 - 1046 pages
...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. 11. An obtuse angle is that which is greater than a right angle. ^ 12.... | |
 | Adrien Marie Legendre, John Farrar - Geometry - 1825 - 280 pages
...line AB (fig. 3) meets another straight line CD in such a manner that the adjacent angles BAC, BADr are equal, each of these angles is called a right angle, and the line AB is said to be perpendicular to CD. Fig. 4. 11. Every angle BAG (fig. 4), less than a right... | |
 | Adrien Marie Legendre, John Farrar - Geometry - 1825 - 294 pages
...line AB (fig- 3) meets another straight line CD in such a manner that the adjacent angles BAC, BAD, are equal, each of these angles is called a right angle, and the line AB is said to be perpendicular to CD. Fig. 4. 11. Every angle BAC (fig. 4), less than a right... | |
 | George Lees - 1826 - 276 pages
...on another straight line CD, makes the adjacent angles ABC and ABD 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. •D OF GEOMETRY. with another CD, upon one side of it, are eitlier two... | |
 | Robert Simson - Trigonometry - 1827 - 546 pages
...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. XL An obtuse angle is that which is greater than a right angle. XII.... | |
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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. 
