 | Elias Loomis - Conic sections - 1849 - 252 pages
...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 - Measurement - 1850 - 294 pages
...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 - Arithmetic - 1852 - 410 pages
...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 pages
...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... | |
 | George Roberts Perkins - Geometry - 1856 - 460 pages
...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 - Conic sections - 1858 - 256 pages
...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... | |
 | George Roberts Perkins - Geometry - 1860 - 472 pages
...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... | |
 | Benjamin Greenleaf - Geometry - 1862 - 532 pages
...as the angle CAB. B D 16. An ACUTE ANGLE is one which is less than a right angle ; as the angle DEF. An OBTUSE ANGLE is one which is greater than a right angle ; as the angle EFG. E< -G B D Acute and obtuse angles have their sides oblique to each other, and are... | |
 | Benjamin Greenleaf - Geometry - 1863 - 504 pages
...CAB. -B, D 16. An ACUTE ANGLE is one which is less than a right angle ; as the angle DEF. E' E. B D An OBTUSE ANGLE is one which is greater than a right angle ; as the angle EFG. x G Acute and obtuse angles have^ their sides oblique to each other, and are sometimes... | |
 | James Maurice Wilson - Geometry - 1868 - 132 pages
...angle; or of the sum of two angles to say that it is equal to the sum of two right angles. Def. 13. An obtuse angle is one which is greater than a right angle. THEOREM 2. From a given point outside a given straight line of indefinite length one perpendicular,... | |
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An Acute Angle is one which is less than a right angle. 
