What Is an Obtuse Angle?

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What Is an Obtuse Angle? (The Lesson)

An obtuse angle is an angle greater than 90° and less than 180°.

obtuse angle

An obtuse angle is greater than a right angle and less than a straight line.

Dictionary Definition

The Oxford English Dictionary defines an obtuse angle as "a plane angle: greater than 90 degrees and less than 180 degrees."

Real Examples of Obtuse Angles

The angles below are all obtuse angles:

example of obtuse angles. 135, 160 and 91 degrees.

See Also

What are degrees?