Answer the following in detail on triangles:
(i) State the SSS congruence criterion for two triangles.
(ii) In △ABC, it is given that AB=AC. Prove that ∠C=∠B.
a. State the SSS congruence criterion for two triangles.
b. In △ABC, it is given that AB=AC. Prove that ∠C=∠B. Explain each step clearly.