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# What Is the Definition of "obtuse Triangle"?

**An obtuse triangle is any triangle that has an angle of more than 90 degrees.** This differs from an acute triangle, in which all three angles are less than 90 degrees, and a right triangle, in which one angle is exactly 90 degrees.

Since the sum of the angles of a triangle is always 180 degrees, no triangle can have more than one obtuse angle. Any obtuse angle between 90 and 178 degrees is possible. A 178-degree angle would product an obtuse isosceles triangle with two acute angles of 1 degree each. The word "obtuse," also used to refer to a slow-witted or insensitive person, derives from the Latin word "obtusus," meaning dulled or blunt.

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Q:
## Why Can't a Triangle Have More Than One Obtuse Angle?

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## What Is the Definition of the "altitude of a Triangle"?

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## What Are the 30-60-90 Triangle Rules?

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## How Many Degrees Does an Equilateral Triangle Have?

A: The sum of the interior angles of an equilateral triangle equals 180 degrees. This stems from the fact that the combined interior angles of any given trian... Full Answer >Filed Under: