An acute angle
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An angle greater than 90 but less than 180 degrees is obtuse An angle greater than 0 but less than 90 degrees is acute A right angle measures 90 degrees
An angle that measures greater than 180o but less than 270o is obtuse.
Acute angle
An acute angle by definition, is an angle that measures anywhere from 1º (or less) to 89º as long as it is smaller than a right angle (90º).
An Obtuse angle is greater than a Right Angle. An Obtuse angle measures more than 90 degrees or pi/2 radians, while a right angle is exactly 90 degrees or pi/2 radians.