Final answer:
In congruent triangles BOX and CAR, the corresponding angle to angle O in triangle BOX is angle R in triangle CAR.
Step-by-step explanation:
The student has asked to name the angle congruent to angle O if triangle BOX is congruent to triangle CAR. To answer this, we must look at how the triangles are named. Since the triangles are congruent, corresponding angles are equal in measure. The corresponding angle to angle O in triangle BOX would be the third letter in the other congruent triangle, which is triangle CAR. Therefore, the angle that is congruent to angle O is angle R.