 | Thomas Noble - Geometrical drawing - 1809 - 94 pages
...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.... | |
 | James Hayward - Geometry - 1829 - 218 pages
...right angles. Remark. An angle which is less than a right angle is called an acute angle ; as A'BD. An angle greater than a right angle is called an obtuse angle, as the angle A'BC. Both obtuse and acute angles are called oblique angles. 14. If other lines were... | |
 | George Darley - Euclid's Elements - 1836 - 172 pages
...the angle FCD is equal to the angle FCE ; that is, FC is perpendicular to AB, by DEF. VI. DEF. VII. An angle greater than a right angle is called an obtuse...less than a right angle is called an acute angle. Thus, if CD be perpendicular to AB, the right line DE from the point D makes with ^ V AB two angles;... | |
 | B[enjamin] Franklin Callender - Measurement - 1836 - 226 pages
...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 an Obtuse Angle, and contains more than ninety degreeS. In the last two angles, the lines forming the sides are oblique... | |
 | John Joseph Griffin - Crystallography - 1841 - 538 pages
...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 - Crystallography - 1841 - 548 pages
...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 pages
...stick is said to be perpendicular to the other, and the angles on 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.—... | |
 | Dana Pond Colburn - 1858 - 288 pages
...angle BCD, and B hence they are right angles. Therefore, BC is perpendi- I cular to A D. A ^ D (e.) An angle greater than a right angle is called an OBTUSE...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... | |
 | Dana Pond Colburn - Arithmetic - 1859 - 288 pages
...BOD, and B bonce they are right angles. Therefore, I! C is perpendi- I cular to A D. A—^—D (e.) An angle greater than a right angle is called an OBTUSE...less than a right angle is called an ACUTE ANGLE. A BIGHT AMJI.E. AN ACUTE ANGLE. AN OBTUSE ANGLE. (f.) A four-sided figure, having all its angles right... | |
 | Samuel Alsop - Surveying - 1865 - 440 pages
...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 angle. ACE (Fig. 2) is an obtuse angle. 35. The distance of a point from a straight line is the length of... | |
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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. 
