what side do dec and edb have in common?; choose the congruence theorem that you would use to prove the triangles congruent.; which of the following would be the reason for line 4 in the proof?; which of the following would be the reason for line 4 in the proof? sss asa sas; match the following items. given: 1 = 2 3 = 4 d midpoint of bc = de prove: a = e; given: 2 = 3 4 = 5 prove: rs = rt; which of the following statements is the reason for line 2 in the proof?; what side do dcb and ebc have in common