 | Benjamin Peirce - Geometry - 1837 - 216 pages
...another, as CD, so as to make -the two adjacent angles ABC and ABD equal, each of these angles is called a Right angle, and the lines are said to be perpendicular to each other. 21. Definitions. An Acute angle is one less than a right angle, as A (fig. 4). An Obtuse angle is one... | |
 | Benjamin Peirce - Geometry - 1847 - 204 pages
...meets or crosses another, so as to make the two adjacent angles equal, each of these angles is called a Right angle, and the lines are said to be perpendicular to each other. Thus the angles ABC and ABD (fig. 5), being equal, are right angles. 21. Definitions. An wScttfe angle... | |
 | Charles Davies - 1852 - 344 pages
...angles. If a straight line meets another straight line, making the adjacent angles equal, each is called a right angle ; and the lines are said to be perpendicular to each other. 295. A right angled triangle is one which has one right angle. In the right angled triangle ABC, the... | |
 | Charles Davies - Arithmetic - 1856 - 450 pages
...angles. If a straight line meets another straight line, making the adjacent angles equal, each is called a right angle ; and the lines are said to be perpendicular to each other. 307. What is a triangle t What is a right angle \ Ba 308. A right angled triangle is one which has... | |
 | George Roberts Perkins - Geometry - 1856 - 460 pages
...or crosses another, so as to make the adjacent angles equal, each of these angles is called a Sight angle, and the lines are said to be perpendicular to each other. XIII. An Acute angle is one which is less than a right angle. XIV. An Obtuse angle is one which is... | |
 | George Roberts Perkins - Geometry - 1860 - 472 pages
...line meets or crosses another, so as to make the adjacent angles equal, each of these angles is called a Right angle, and the lines are said to be perpendicular to each other. XIII. An Acute angle is one which is less than a right angle. XIV. An Obtuse angle is one which is... | |
 | Charles Davies - Arithmetic - 1861 - 496 pages
...angles. If a straight line meets another straight line, making the adjacent angles equal, each is called a right angle ; and the lines are said to be perpendicular to each other. 382. A RIGHT-ANGLED triangle is one which has one right angle. In the right-angled triangle ABC, the... | |
 | Charles Davies - Arithmetic - 1863 - 346 pages
...angles. If a straight line meets another straight line, making the adjacent angles equal, each is called, a right angle ; and the lines are said to be perpendicular to each other. 365. A RIGHT-ANGLED TRIANGLE is one which has one right angle. In the right-angled triangle ABC, the... | |
 | Samuel Alsop - Surveying - 1865 - 440 pages
...straight line stands on another so as to make the adjacent angles equal, each of these angles is called a right angle; and the lines are said to be perpendicular to each other. Thus, (Fig. 2,) if ACD = BCD, each is a right angle, and CD is perpendicular to AB. A o B 33. An angle... | |
 | Malcolm MacVicar - Arithmetic - 1876 - 412 pages
...HORIZONTAL. Two Bight Angles. One Sight Angle. Acute Angle. 781. When a line meets another line, making, as shown in (1), two equal angles, each angle is a Right...lines are said to be perpendicular to each other. 782. An Obtuse Angle, as shown in (8), is greater than a right angle, and an Acute Angle, as shown... | |
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... angles is called a right angle, and the lines are said to be perpendicular to each other. Thus... 
