 | Thomas Noble - 1809 - 94 σελίδες
...to be at right angles with it; and the angle or angles, it makes with it, are called right angles. An angle less than a right angle is called an acute angle. An angle greater than a right angle is an obtuse angle. V. To make an Angle equal to a given Angle.... | |
 | George Darley - 1836 - 172 σελίδες
...perpendicular to it, 12. DEF. VII. An angle greater than a right angle is called an obtuse angle; and an angle less than a right angle is called an acute angle, 13. DF.F. VIII. If two right lines cut each other so as to form four angles, each opposite pair arc... | |
 | B[enjamin] Franklin Callender - 1836 - 226 σελίδες
...be perpendicular, the angle is a right angle in whatever position it may be placed. An Acute Angle. An angle less than a right angle, is called an Acute Angle, and contains less than ninety degrees. An Obtuse Angle. An angle greater than a right angle, is called... | |
 | John Joseph Griffin - 1841 - 538 σελίδες
...greater than a right angle is called an Muse angle. See the plane angles of the plane P of Model 7. An angle less than a right angle is called an acute angle. See the plane angles of Model 117. 17. The EDGES of different crystals have different degrees of sharpness,... | |
 | John Joseph Griffin - 1841 - 548 σελίδες
...greater than a right angle is called an obttue angle. See the plane angles of the plane P of Model 7. An angle less than a right angle is called an acute angle. See the plane angles of Model 117. 17. The EDGES of different crystals have different degrees of sharpness,... | |
 | Reading book - 1856 - 352 σελίδες
...either side are called right angles. An angle greater than a right angle is called an obtuse angle ; an angle less than a right angle is called an acute angle. LESSON 76. FIEST LESSONS IN GEOMETKY.— PABT II. Definitions — continued. THE area of a figure is... | |
 | Dana Pond Colburn - 1858 - 288 σελίδες
...perpendi- I cular to A D. A ^ D (e.) An angle greater than a right angle is called an OBTUSE ANGLE, and an angle less than a right angle is called an ACUTE ANGLE. 3 A BIGHT ANCLE. AN ACUTE ANGLE. AN OBTUSE ANCLE, (f.) A four-sided figure, having all its angles right... | |
 | William Harris Johnston - 1865 - 478 σελίδες
...together equal to two right angles. An angle greater than a right angle is called an obtuse angle. An angle less than a right angle is called an acute angle. AB the measurement of angular magnitudes does not necessarily enter into any part of the business of... | |
 | Samuel Alsop - 1865 - 440 σελίδες
...other. Thus, (Fig. 2,) if ACD = BCD, each is a right angle, and CD is perpendicular to AB. A o B 33. An angle less than a right angle is called an acute angle. Thus, BCE or ECD (Fig. 2) is an acute angle. 34. An angle greater than a right angle is called an obtuse... | |
 | Henry Kiddle - 1868 - 300 σελίδες
...to be perpendicular to a circle when it passes, or would pass if prolonged, through the centre. 24. An angle less than a right angle is called an ACUTE ANGLE ; one greater than a right angle is called an OBTUSE .ANGLE. . Fig. 7. In the annexed diagram, the... | |
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An angle less than a right angle is called an acute angle; an angle greater than a right angle and less than two right angles is called an obtuse angle. 
