Answer: ∠BAR ≅ ∠CAR
Step-by-step explanation:
Recall what happens when a line bisects an angle. If a line bisects an angle, it forms two equal angles on either side of the bisector. Since you need to prove that line AR bisects ∠BAC.
So in order to prove that it bisects, you'd need to prove that ΔRBA is congruent to ΔRCA
Hence, ∠BAR ≅ ∠CAR