How is an obtuse angle defined?

An obtuse angle is defined as an angle that measures more than 90 degrees but less than 180 degrees. This means that it is larger than a right angle but not large enough to be considered a straight angle. This range of measurement distinguishes obtuse angles from both acute angles, which are less than 90 degrees, and straight angles, which are exactly 180 degrees. By focusing on the correct definition, the concept of an obtuse angle can be clearly understood in the context of angle classifications based on measurements.