An acute angle is an angle that measures less than 90 degrees and bigger than 0 degree.
If the measure of an angle is 60 degrees for example, the angle is an acute angle.
The angle shown with 2 red rays is an acute angle.
An angle is still acute even if it is slightly smaller 90 degrees and slightly bigger than 0 degree.
For example, if an angle measures 0.01 or 89.99, it is still an acute angle.
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