Answer:
Explanation:
If an angle measures 90, then it is Right angle.
If the angle measures more than 90, then it is Obtuse angle.
If the angle measure less than 90, then it is an acute angle.
∠A = Right angle as it is 90.
∠B = Obtuse angles as it is > 90
∠C = Acute angle as it is < 90
∠D = Obtuse angle as it is >90