What characteristic describes an obtuse angle?

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 (which is exactly 90 degrees) and smaller than a straight angle (which is exactly 180 degrees). The correct answer highlights this specific range, distinguishing obtuse angles from acute angles (which are less than 90 degrees) and straight angles (which are exactly 180 degrees). Understanding these definitions is key to identifying and classifying angles accurately in various mathematical contexts.