90 degrees is a right angle
lower than 90 is an acute angle
higher than 90 but less than 180 is an obtuse angle
180 is a line
Greater than 180 is a reflex angle
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A non negative angle which is less than 90 degrees is an acute angle. So, Zero degree is an acute angle.
Is 65 an acute angle
An acute angle.
An acute angle
An acute angle