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" An acute angle is an angle less than a right angle. An obtuse angle is an angle greater than a right angle, but less than a straight angle. "
Business Mathematics: A Textbook - Page 260
by Edward Ira Edgerton, Wallace Edgar Bartholomew - 1922 - 305 pages
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Dictation Lessons in Drawing: For Primary Grades : to Accompany White's ...

Sarah Frances Buckelew - Drawing - 1878 - 154 pages
...perpendicular to the other line, and the angles are right angles. A Right Angle is an angle of 90°. An Acute Angle is an angle less than a right angle. An...Obtuse Angle is an angle greater than a right angle. PLANE FIGURES. A Plane Figure is. a portion of a plane limited by lines either straight or curved....
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Elementary Synthetic Geometry

George Bruce Halsted - Geometry - 1896 - 208 pages
...a right angle are called complemcntal. 1 02. An angle less than a right angle is called acute. 103. An angle greater than a right angle, but less than a straight angle, is called obtuse. 104. An angle greater than a straight angle, but less than a perigon, is called reflex....
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An Examination Manual in Plane Geometry

George Albert Wentworth, George Anthony Hill - Geometry - 1894 - 150 pages
...to half a straight angle, or 90 degrees. 29. An Acute Angle is an angle less than a right angle. 30. An Obtuse Angle is an angle greater than a right angle, but less than a straight angle. 31. Supplementary Angles are two angles whose sum equal 180 degrees. 32. Complementary Angles are two...
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A Complete Arithmetic: With Oral and Written Exercises

George Washington Hull - Arithmetic - 1895 - 408 pages
...adjacent angles equal, the lines are perpendicular to each other, and the angles are Rigid Angles. An Acute Angle is an angle less than a right angle. An...Obtuse Angle is an angle greater than a right angle. SURFACES. 238. A Surface is that which has length and breadth only. A Plane Surface, or a Plane, is...
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Elements of Geometry, Volume 1

Andrew Wheeler Phillips, Irving Fisher - Geometry, Modern - 1896 - 276 pages
...point of intersection with the second line is called the foot of the perpendicular. 17. Def. — An acute angle is an angle less than a right angle ; an obtuse angle, greater. The term oblique angle may be applied to any angle which is not a right angle. PROPOSITION...
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Elements of Geometry, Part 1

Andrew Wheeler Phillips, Irving Fisher - Geometry - 1896 - 276 pages
...point of intersection with the second line is called the foot of the perpendicular. - 17. Def. — An acute angle is an angle less than a right angle ; an obtuse angle, greater. The term oblique angle may be applied to any angle which is not a right angle. > PROPOSITION...
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Plane and Solid Geometry

Arthur Schultze - 1901 - 392 pages
...•D N FIG. 11. 32. An acute angle is an angle less than a right angle, as angle IKH. QFIG. 12. 33. An obtuse angle is an angle greater than a right angle, but less than a straight angle, as GKI. 34. A reflex angle is an angle greater than a straight angle, but less than two straight angles,...
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Plane Geometry

Arthur Schultze - 1901 - 260 pages
...than a right angle, as angle IKH. E. Fio. 9. .D FIG. 10. N FIG. 1L 33. An obtuse angle is FlG ' 12 . an angle greater than a right angle, but less than a straight angle, as GKI. 34. A reflex angle is an angle greater than a straight angle, but less than two straight angles,...
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American Handy-book of the Brewing, Malting and Auxiliary Trades ...

Robert Wahl, Max Henius - Brewing - 1902 - 1290 pages
...proceeding from one common point. A "right" angle is formed by two lines perpendicular to each other. An "acute" angle is an angle less than a right angle...."obtuse" angle is an angle greater than a right angle. A "surface" is that which has two dimensions — that is, length and breadth. A "plane" is a surface...
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Ellen: Or, Whisperings of an Old Pine, Volume 1

Joseph Battell - Force and energy - 1903 - 722 pages
...But if a point is no part of a line, how can it have a point of intersection? ' DEFINITIONS. — An acute angle is an angle less than a right angle ; an obtuse angle, greater. 'The term oblique angle may be applied to any angle which is not a right angle.' " Ellen will...
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