Obtuse Angle Definition

noun
  • geometry
    an angle that measures more than 90 degrees but less than 180 degrees.
    "the angle is obtuse."

Explanation

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees. In other words, it is larger than a right angle and smaller than a straight angle.

Related Terms

An angle is the figure formed by two rays sharing a common endpoint called the vertex. Its size, measured in degrees or radians, is the amount of rotation needed to align one ray with the other.

An acute angle is an angle that measures less than 90 degrees.

A right angle is an angle of exactly 90 degrees, a quarter of a full turn.

A reflex angle is an angle whose measure is greater than 180 degrees but less than 360 degrees.

Degrees are a unit of measurement for angles, representing the rotation between two rays. The degree angle system divides a full rotation into 360 units called degrees.