### Definition of Obtuse angle

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

**Oblique Angle**

### Obtuse Angle Pictures

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### Lexicographical Neighbors of Obtuse Angle

### 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 angle**d 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 angle**s A as a
consequence of the definition of the cosine of an **obtuse angle**. ..."

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