 | George Albert Wentworth - Arithmetic - 1897 - 480 pages
...90°, and is called a right angle, as AOB ; and OA and OB are said to be perpendicular to each other. An angle less than a right angle is called an acute angle; an an^le greater than a right angle and less than two right angles is called an obtuse angle. Units of... | |
 | George Albert Wentworth - Arithmetic - 1898 - 424 pages
...degrees, and is called a right angle, as AOB ; and OA and OB are said to be perpendicular to each other. An angle less than a right angle is called an acute...less than two right angles is called an obtuse angle. TABLE. 60 seconds (") = 1 minute O60 minutes = 1 degree (°). 360 degrees = 1 revolution or circumference.... | |
 | George Albert Wentworth - 1898 - 424 pages
...degrees, and is called a right angle, as AOB ; and OA and OB are said to ^perpendicular to each other. An angle less than a right angle is called an acute...less than two right angles is called an obtuse angle. TABLE. 60 seconds (") = 1 minute ('). 60 minutes = 1 degree (°). 360 degrees = 1 revolution or circumference.... | |
 | George Albert Wentworth - Arithmetic - 1898 - 424 pages
...degrees, and is called a right angle, as A OB ; and OA and OB are said to be perpendicular to each other. An angle less than a right angle is called an acute...less than two right angles is called an obtuse angle. TABLE. 60 seconds (") = 1 minute C). 60 minutes = 1 degree (°). 360 degrees — 1 revolution or circumference.... | |
 | William James Milne - Geometry, Modern - 1899 - 258 pages
...angle A OB is a straight angle. A straight angle is equal to two right angles. Via. 10. FIG. 11. 28. An angle less than a right angle is called an Acute Angle. 29. An angle greater than a right angle and less than a straight angle is called an Obtuse Angle. 30.... | |
 | William James Milne - Geometry - 1899 - 396 pages
...directions from the vertex 0, the A Fi<,°9 angle AOB is a straight angle. GEOMETRY. FIG. 10. FIG. 11. 28. An angle less than a right angle is called an Acute Angle. 29. An angle greater than a right angle and less than a straight angle is called an Obtuse Angle. 30.... | |
 | George Albert Wentworth - Geometry, Modern - 1899 - 272 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). FIO. 13. 69. An angle greater than a right angle and D less than a straight... | |
 | John Henry Walsh - Arithmetic - 1899 - 264 pages
...angles? Why? What name is given to lines that will not meet, no matter how far they are extended? 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?... | |
 | George Albert Wentworth - Geometry - 1899 - 498 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). FIO. 13. Tle greater than a right angle and -D •'ight angle is •"••lied... | |
 | 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... | |
| |
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. 
