An acute angle.
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An angle of 86 degrees is an acute angle.
86 degrees, like any angle of less than 90 degrees, is an acute angle.
90-4 = 86 degrees.
An angle of between 90 degrees and 180 degrees is called an obtuse angle, an angle that is exactly 180 degrees is called a straight angle (because it creates a straight line), and an angle of more then 180 degrees is called a reflex angle.
An angle of 90 degrees is a right angle.