An acute angle.
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An 86-degree angle is called an obtuse angle. However, it is important to note that an obtuse angle is defined as being greater than 90 degrees. Therefore, an 86-degree angle is actually classified as an acute angle, which is any angle less than 90 degrees.
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.