An acute angle.
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It's called an acute angle.
A null angle and an acute angle are less than a right angle.
An acute angle is an angle of less than 90°. A 90° angle is a right angle, the angle you find at two adjoining edges of a square. An angle smaller than a right angle is called an acute angle, while an angle larger than it is called and obtuse angle.
The name of the angle you are looking for is an obtuse angle. For review here are all the names and classifications:Any angle less than 90 degrees is an acute angle.Any angle equal to 90 degrees is a right angle.Any angle greater than 90 degrees but less than 180 degrees is an obtuse angle.Any angle equal to 180 degrees is a straight angle.Any angle greater than 180 degrees but less than 360 degrees is called a reflex angle.
An acute angle