an angle less than 90
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<90 is an Acute angle =90 is a Right angle >90 is an Obtuse angle
An angle greater than 0 but less than 90 degrees is an acute angle.
An angle greater than 0 but less than 90 degrees is an acute angle.
An acute angle is less than 90 degrees and zero degrees.
Obtuse. An acute angle is less than 90 degrees, a right angle is 90 degrees, and an obtuse angle is more than 90 degrees.