Answer: (a)The numbered angles that are congruent to the given angle are 3 in number
(b) They are : 3 , 4 and 5
Explanation:
Recall ; Angles are congruent if they have the same angle measure in degrees.
Angle 4 is alternate to the given angle 99 , that means they are congruent.
Angle 3 is vertically opposite to angle 4 , which means they are the same , then angle 3 is congruent to 99.
Angle 5 is vertically opposite to 99 , which means they are the same , therefore they are congruent.