In triangle ABC, we are given ∠A = 67° and ∠C = 46°. Hence, ∠B = 180° - ∠A - ∠C = 180° - 67° - 46° = 67°. Thus, in triangle ABC angles A and B are congruent. Hence, the triangle ABC is isosceles with congruent angles A and B at the base AB. So, vertex opposite to the base is C. From it, we conclude that CA = CB. QED. At this point, the proof is complete.