acute angles are angles that are less than 90 degrees
right angle are angles that are exactly 90 degrees
obtuse angles are angles that are morethan  90 degrees
Acute angle- an acute angle is an less 90°
Ex. 45° 56° 89°
Right angle- a right angle is an exactly 90°
Straight angle- a straight angle is an 180°
Obtuse angle- an obtuse angle is an more than 90°
Ex.145° 166° 123°
Reflex angle- a reflex angle is a more than 180°