 | Adelia Roberts Hornbrook - Arithmetic - 1900 - 428 pages
...the folds ? 58. Find right angles made by lines in the surfaces of the room or of objects in it. 59. An angle less than a right angle is called an Acute Angle. Draw an acute angle. SUGGESTIOH TO TEACHER. As children naturally FIG. 14. judge of the size of an... | |
 | William Estabrook Chancellor - Arithmetic - 1901 - 152 pages
...equal to each other, then ABD and DBO are each right angles, and DB and AC perpendicular to each other. An angle greater than a right angle is called an obtuse angle, and one less than a right angle is called an acute angle. в DEVELOP 120 SURFACES A plane has two dimensions,... | |
 | George Albert Wentworth, George Anthony Hill - Geometry - 1901 - 174 pages
...has made one revolution and generated an angle equal to four right angles, or two straight angles. An angle less than a right angle is called an acute angle. An angle greater than a right angle and less than a straight angle is called an obtuse angle. The angle... | |
 | Metal-work - 1901 - 548 pages
...right angle is called an oblique angle. An angle less than a right angle is called an acute angle, and an angle greater than a right angle is called an obtuse angle. In Fig. 5, BOC is an acute angle and COA an obtuse angle. 14. A right angle is divided into 90 equal... | |
 | Charles Godfrey, Arthur Warry Siddons - Geometry - 1903 - 384 pages
...another. Such angles are called right angles. An angle less than a right angle is called an acute angle. An angle greater than a right angle is called an obtuse angle. Ex. 31. Make a right angle BOC as in Ex. 30, cut it out and fold so that OB falls on OC. Does the crease... | |
 | James McMahon - Geometry, Plane - 1903 - 380 pages
...angle turned through is called a perigon. 17. The half of a straight angle is called a right angle. 18. An angle less than a right angle is called an acute angle. 19. An angle greater than a right angle and less than a straight angle is called an obtuse angle. 20.... | |
 | John Henry Walsh - Algebra - 1903 - 526 pages
...angles? Why? What name is given to lines that will not meet, no matter how far they are extended 1 9. An angle less than a right angle is called an acute angle. Draw a triangle containing an acute angle. 10. Can you draw a triangle containing two acute angles... | |
 | John Henry Walsh - Algebra - 1903 - 564 pages
...an acute angle. 10. Can you draw a triangle containing two acute angles ? Three acute angles ? 11. An angle greater than a right angle is called an obtuse angle. Draw a triangle containing an obtuse angle. 12. Can you draw a triangle containing three obtuse angles... | |
 | George Albert Wentworth - Geometry - 1904 - 496 pages
...opposite directions from C is a straight angle. 67. COR. A right angle is half a straight angle. 68. An angle less than a right angle is called an acute angle; as, angle A (Fig. 13). FIG. 13. 69. An angle greater than a right angle and -D less than a straight... | |
 | Isaac Newton Failor - Geometry - 1904 - 100 pages
...foot of the perpendicular GH. FIG. 19.—The Carpenter's Square. Fio. 20.—Acute Angle. Acute Angle. An angle less than a right angle is called an acute angle; as, angle H (Fig. 20). FIG. 21.—Obtuse Angle. Fio. 22.—Oblique Angles and Oblique Lines. Obtuse... | |
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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. 
