An angle smaller than a right angle - is an acute angle. Larger than a right angle, but smaller than 180 degrees is an obtuse angle. Angles between 180 and 360 degrees are reflex angles.
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there are 4 angles and normally, there would be 2 angles that are smaller than a right angle Except of cause if the parallelogram is a square or a rectangle, all angles are equal to 90 i.e. right angle
an angle measuring less than 90 degrees is called an acute angle
An acute triangle is a triangle with all angles smaller than a 90 degree right angle.
Acute angles
A angle that is smaller than 90 degrees is an acute angle.