 | Elias Loomis - 1849 - 252 sider
...other is called a perpendicular to it. 11. An acute angle is one which is less than a right angle. An obtuse angle is one which is greater than a right angle. in the same plane, and which, being produced 12. Parallel straight lines are such as are 13. A plane... | |
 | John Radford Young - 1850 - 294 sider
...sides beyond the vertex, be equal to it. 7. An ACUTE ANGLE is one which is less than a right angle. 8. An OBTUSE ANGLE is one which is greater than a right angle. Therefore, angles are of three kinds: — right, acute, and obtuse. 9. A PLANE TRIANGLE is a. figure... | |
 | James B. Dodd - 1852 - 410 sider
...a risht angle. CE AM An acute angle is one which is less than a right angle, as the angle CBE ; and an obtuse angle is one which is greater than a right angle, as the angle ABE. § 37§. One straight line is perpendicular to another when they form a right angle... | |
 | James B. Dodd - 1853 - 398 sider
...is a right angle. Ji An acute angle is one which is less than a right angle, as the angle CBE; and an obtuse angle is one which is greater than a right angle, as the angle ABE. § 379. Two straight lines are parallel to each other when they are everywhere equidistant... | |
 | Jacques Eugène Armengaud (the Elder.), William Johnson - 1853 - 416 sider
...when, however, they cross each other without being perpendicular, they form acute or obtuse angles. An acute angle is one which is less than a right angle, as F c D, fig. 2 ; and an obtuse angle is greater than a right angle, as GC D. By angle is generally... | |
 | william johnson - 1854 - 212 sider
...when, however, they cross each other without being perpendicular, they form acute or obtuse angles. An acute angle is one which is less than a right angle, as F c D, fig. 2 ; and an obtuse angle is greater than a right angle, as G c D. By angle is generally... | |
 | George Roberts Perkins - 1856 - 460 sider
...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 greater \ than a right angle. XV. When the sum of two angles is equal to a right angle, they are called Complementary angles ; each... | |
 | Elias Loomis - 1858 - 256 sider
...other is called a perpendicular to it. 11. An acute angle is one which is less than a right angle. An obtuse angle is one which is greater than a right angle. 12. Parallel straight lines are such as are in the same plane, and which, being produced ever so far... | |
 | William Johnson - 1860 - 442 sider
...such lines meet or cross each other without being perpendicular, they form acute or obtuse angles. An acute angle is one which is less than a right angle, as F с n, Fig. 8; ami an obtuse angle is greater than a right angle, as o с D. By angle is generally... | |
 | George Roberts Perkins - 1860 - 472 sider
...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 greater \ than a right angle. XV. When the sum of two angles is equal to a right angle, they are called Complementary angles ; each... | |
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An ACUTE ANGLE is one which is less than a right angle ; as the angle DEF. 
