 | Elias Loomis - Conic sections - 1849 - 252 pages
...called a right angle, and the straight line which meets the other is called a perpendicular to it. 11. An acute angle is one which is less than a right angle....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 - Measurement - 1850 - 294 pages
...adjacent angle, that would be formed by producing one of the 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:... | |
 | James B. Dodd - Arithmetic - 1852 - 410 pages
...Thus if the two angles ABC and 0 BD are equal to each, other, each of them is 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.... | |
 | James B. Dodd - 1853 - 398 pages
...line. Thus if the two angles ABC and CBD are equal to each other, each of them 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.... | |
 | william johnson - 1854 - 212 pages
...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 - Geometry - 1856 - 460 pages
...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 greater \ than a right angle. XV. When the sum of two angles is... | |
 | Elias Loomis - Conic sections - 1858 - 256 pages
...called a right angle, and the straight line which meets the other is called a perpendicular to it. 11. An acute angle is one which is less than a right angle....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... | |
 | Elias Loomis - Conic sections - 1860 - 246 pages
...of the two angles BCE, ECD; and the angle ECD is the difference between the two angles BCD, BCE. 11. An acute angle is one which is less than a right angle. . An obtuse angle is one which \e greater than a right angle. in the same plane, and which, being produced 12. Parallel .straight... | |
 | William Johnson - 1860 - 442 pages
...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... | |
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An ACUTE ANGLE is one which is less than a right angle ; as the angle DEF. 
