No, Δ A B C and ΔD C B aren't congruent because they share a side.
Yes, ΔABC and ΔDCB can be proven congruent by HL.
Yes, Δ A B C and Δ D C B can be proven congruent by SSS.
No, there isn't enough information because only two pairs of corresponding sides can't be used to prove that two triangles are congruent.
