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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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## Practical Perspective, Exemplified on Landscapes

Thomas Noble - Geometrical drawing - 1809 - 94 pages
...to be at right angles with it; and the angle or angles, it makes with it, are called right angles. An angle less than a right angle is called an acute angle. An angle greater than a right angle is an obtuse angle. V. To make an Angle equal to a given Angle. CAB (Fig- 5) is the given angle, and...
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## A System of Popular Geometry: Containing in a Few Lessons So Much of the ...

George Darley - Euclid's Elements - 1836 - 172 pages
...perpendicular to it, 12. DEF. VII. 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, 13. DF.F. VIII. If two right lines cut each other so as to form four angles, each opposite pair arc...
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## Geometry: Applied to the Mensuration of Lines, Surfaces, Solids, Heights and ...

B[enjamin] Franklin Callender - Measurement - 1836 - 226 pages
...be perpendicular, the angle is a right angle in whatever position it may be placed. An Acute Angle. An angle less than a right angle, is called an Acute Angle, and contains less than ninety degrees. An Obtuse Angle. An angle greater than a right angle, is called...
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## A System of Crystallography, with Its Application to Mineralogy

John Joseph Griffin - Crystallography - 1841 - 538 pages
...greater than a right angle is called an Muse angle. See the plane angles of the plane P of Model 7. An angle less than a right angle is called an acute angle. See the plane angles of Model 117. 17. The EDGES of different crystals have different degrees of sharpness,...
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## A System of Crystallography, with Its Application to Mineralogy

John Joseph Griffin - Crystallography - 1841 - 546 pages
...greater than a right angle is called an obttue angle. See the plane angles of the plane P of Model 7. An angle less than a right angle is called an acute angle. See the plane angles of Model 117. 17. The EDGES of different crystals have different degrees of sharpness,...
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## Plane and Solid Geometry: To which is Added Plane and Spherical Trigonometry ...

George Roberts Perkins - Geometry - 1856 - 460 pages
...directions, they are said to form an angle equal to two right angles. An angle such as C0AC4, which is greater than a right angle and less than, two right angles, is called an obtuse angle. § 5. All the foregoing relations hold good, whatever be the length of the radius A00. For simplicity,...
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## Second (-Fourth) reading book. Scriptural and miscellaneous ..., Volume 4

Reading book - 1856
...either side are called right angles. An angle greater than a right angle is called an obtuse angle ; an angle less than a right angle is called an acute angle. LESSON 76. FIEST LESSONS IN GEOMETKY.— PABT II. Definitions — continued. THE area of a figure is...
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## The Common-school Arithmetic: a Practical Treatise on the Science of Numbers

Dana Pond Colburn - 1858 - 290 pages
...perpendi- I cular to A D. A ^ D (e.) 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. 3 A BIGHT ANCLE. AN ACUTE ANGLE. AN OBTUSE ANCLE, (f.) A four-sided figure, having all its angles right...
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## Plane and Solid Geometry: To which is Added Plane and Spherical Trigonometry ...

George Roberts Perkins - Geometry - 1860 - 443 pages
...directions, they are said to form an angle equal to two right angles. An angle such as CoAC4, which is greater than a right angle and less than, two right angles, is called an obtuse angle. § 5. All the foregoing relations hold good, whatever be the length of the radius AC0. For simplicity,...
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## Loftus's Inland Revenue Officers' Manual: a guide to the duties and ...

William Harris JOHNSTON - 1865
...together equal to two right angles. An angle greater than a right angle is called an obtuse angle. An angle less than a right angle is called an acute angle. AB the measurement of angular magnitudes does not necessarily enter into any part of the business of...
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