If ΔABC = ΔADC, then B. BC = DC by CPCTC.
CPCTC is an acronym for Corresponding Parts of Congruent Triangles are Congruent.
Answer choice C and D are not appropriate answers because they are not the corresponding angles of the triangles.
Answer choice A is not the appropriate answer because although the statement is true, CPCTC would not be the correct reasoning.
