 | Charles Austin Hobbs - Arithmetic - 1889 - 370 pages
...angles are called oblique angles. 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. A plane figure is a portion of a plane surface bounded by straight or curved lines. A polygon is a... | |
 | Euclid - Geometry - 1890 - 442 pages
...angle. Def. If a triangle has one of its angles obtuse, it is called an obtuse-angled triangle. Def. An angle less than a right angle is called an acute angle. Def. If a triangle has three acute angles, it is called an acuteangled triangle. Def. A plane rectilineal... | |
 | John Henry Walsh - Arithmetic - 1893 - 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?... | |
 | Charles Ambrose Van Velzer, George Clinton Shutts - Geometry - 1894 - 522 pages
...If angle A 0 B equals angle AOC, the angles AOB and A 0 C are each right angles. 0 21. Definition. 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. Angle BOC is an AOC acute angle,... | |
 | Henry Martyn Taylor - Euclid's Elements - 1895 - 708 pages
...superposition. A proof will be found on a subsequent page. (p. 37) x^ DEFINITION 12. An angle lesi <wi a right angle is called an acute angle. An angle greater than a rignt, Dingle and less than two right angles is called an obtuse angle. DEFINITION 13. A line, which... | |
 | John Henry Walsh - Arithmetic - 1895 - 480 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 - Arithmetic - 1896 - 490 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...less than two right angles is called an obtuse angle. Units of Angular Measure. 213. 60 seconds (") = 1 minute ("). 60 minutes = 1 degree (°). 360 degrees... | |
 | Seymour Eaton - Business - 1896 - 330 pages
...angles are called right angles. 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. A surface has length and breath without thickness. A plane surface is a level surface. The amount of... | |
 | William Seneca Sutton - 1896 - 342 pages
...rectangle whose four sides are equal. An angle greater than a right angle is called an obtuse angle. An angle less than a right angle is called an acute angle. 363. The Altitude of a triangle is the shortest distance to the base from the angle opposite the base... | |
 | George Albert Wentworth - Arithmetic - 1897 - 396 pages
...90°, and is called a right angle, as AOB ; and OA and OS 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. » Units of Angular Measure. 213. 60 seconds (") = 1 minute ("). 60 minutes = 1 degree (°). 360 degrees... | |
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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. 
