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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. "
Euclid's Elements of Geometry - Page 7
edited by - 1893 - 504 pages
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First Steps in Geometry

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...An angle greater than a right angle and less than a straight angle is called an obtuse angle. The angle formed by any two straight lines may be regarded...
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Elementary Geometry, Plane and Solid: For Use in High Schools and Academies

Thomas Franklin Holgate - Geometry - 1901 - 460 pages
...right angle. An angle which is less than a right angle is called an acute angle. An angle which is greater than a right angle and less than two right angles is called an obtuse angle. An acute angle is always less than its supplement, while an obtuse angle is greater than its supplement....
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A Textbook on Sheet-metal Pattern Drafting, Volume 1

Metal-work - 1901 - 548 pages
...perpendicular to O B. FIG. 3. FIG. 4. 13. Any angle that is not a 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...
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Practical Marine Engineering for Marine Engineers and Students: With Aids ...

William Frederick Durand - Marine engineering - 1901 - 734 pages
...such as those formed at E is called a right angle. An angle less than a right angle, as AOB, Fig. a, is called an acute angle. An angle greater than a right angle, as FEB, Fig. b, is called an obtuse angle. Rule — Square the side, or multiply it by itself ; or...
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Elementary Geometry, Plane and Solid: For Use in High Schools and Academies

Thomas Franklin Holgate - Geometry - 1901 - 462 pages
...them must be less than a right angle, and the other, greater than a right angle. An angle which is less than a right angle is called an acute angle. An angle which is greater than a right angle and less than two right angles is called an obtuse angle. An acute...
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A Practical Arithmetic

George Albert Wentworth - Arithmetic - 1902 - 440 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 anprJe greater than a right angle and less than two right angles is called an obtuse angle. Units of...
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Elementary Geometry: Practical and Theoretical

Charles Godfrey, Arthur Warry Siddons - Geometry - 1903 - 384 pages
...they are all equal for when folded they fitted on one 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...
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Elementary Geometry: Plane

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....
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New Grammar School Arithmetic

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...
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Inventional Geometry

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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