That's an 'acute' angle.
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The measure of an angle with a measure between 0° and 90° or with less than 90° radiant.Also Known As: A positive angle that measures less than 90°
The angle with measure more than 0 degrees and less than 90 degrees is an acute angle, the angle with measure 90 degrees is a right angle,the angle with measure more than 90 degrees and less than 180 degrees is an obtuse angle and the angle with measure 180 degrees is a straight angle. Finally, an angle of more than 180 degrees and less than 360 degrees is a reflex angle.
It is an obtuse angle which is greater than 90 but less than 180 degrees
The measure of an acute angle is anything less than 90 degrees, or a right angle.
An obtuse angle is DEFINED as an angle whose measure is greater than 90 degrees and less than 180 degrees.