### Definition of Obtuse angle

1. Noun. An angle between 90 and 180 degrees.

Generic synonyms: Oblique Angle

### Obtuse Angle Pictures

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### Lexicographical Neighbors of Obtuse Angle

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### Literary usage of Obtuse angle

Below you will find example usage of this term as found in modern and/or classical literature:

1. Plane and Spherical Trigonometry by Arthur Graham Hall, Fred Goodrich Frink (1910)
"CHAPTER V THE obtuse angle 32. Definitions of the trigonometric functions ... If an obtuse angle (ie an angle greater than 90° and less than 180°) is placed ..."

2. The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago by Robert Simson, Euclid (1838)
"Let ABC be an obtuse angled triangle, having the obtuse angle ACB, and from the point A let AD be drawn (12. 1,) perpendicular to BC produced: the square of ..."

3. The Real Blake: A Portrait Biography by Edwin John Ellis (1907)
"No, said obtuse angle. " How could you be so foolish as to think that he was? ... obtuse angle said, "In the first place you thought he was, and then when ..."

4. A Treatise on Mineralogy by Charles Upham Shepard (1857)
"It is here supposed to lean in the direction ca, so that the terminal plane P forms an obtuse angle with the edge d. The planes MM may meet at an acute or ..."

5. Plane Trigonometry and Applications by Ernest Julius Wilczynski (1914)
"The relation cos A = — cos (180° — A) is true for all obtuse angles A as a consequence of the definition of the cosine of an obtuse angle. ..."