In △ABC and △DEF, the following measurements are given:
AB=5 cm, BC=7 cm, CA=6 cm,
DE=7 cm, EF=6 cm and FD=5 cm.
(a) Determine whether the two triangles are congruent.
(b) If they are congruent, write the correct correspondence of vertices.
(c) Using your correspondence, find the length of DF when AC is extended and a point G is chosen on it such that CG=DF. Calculate the length CG.