It's called an acute angle.
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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.
Right angle is 90degrees acute angle is less than 90 degrees
An obtuse angle, one larger than a right angle but less than a straight line
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.