4. No, a chord has endpoints on the edges of a circle while a radius has endpoints on the center of the circle and an edge.
5. Since the chords are not congruent, the lines cannot be congruent.
Step-by-step explanation:
Using Theorem 84, we can find that since CA = BD, the corresponding arcs are congruent. Using this theorem, we can find the answers to the rest of the questions.