Acute angles.
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They are obtuse angles.
A right angle must have two acute angles because since one angle is ninety degrees, than the other two must equal ninety degrees. To make ninety degrees with two angles, both of them must be acute, or less than 90 degrees (each).
They are as follows:- Acute angles are greater than 0 but less than 90 degrees Right angles are 90 degrees Obtuse angles are greater than 90 but less than 180 degrees Reflex angles are greater than 180 but less than 360 degrees A full rotation is 360 degrees
180 is a straight line, so all angles have to be less than that.
A 40 degree angle is an acute angle, since all angles less than 90 are acute.