Answer:
The measure of angle xba is 43°
Step-by-step explanation:
we know that
If ray ba bisects the angle xby, then the measure of angle xby is divided into two equal angles
see the attached figure to better understand the problem
so
∠xba=∠aby
∠xba+∠aby=∠xby
we have
∠xby=86°
therefore
∠xba=∠xby/2=86°/2=43°
