Given: AB intersects DE at point C. Prove: ZDCB ZECA What is the missing reason in step 5? O linear pair postulate given O definition of complementary angles O congruent complements theorem B E 1. Statements AB intersects DE at point C. 2. DCB and ZBCE are a linear pair. 3. ZDCB is supp. to BCE. 4. ZBCE and ZECA are a linear pair. 5. ZBCE is supp. to ZECA. 6. DCB ZECA Reasons 1 given 2. def. of lin pr. 3. linear pair post. 4. def. of lin pr. 5. ? 6. a supp. thm.