Given: Z1 is complementary to Z2. What is the missing statement in step 3 of the proof? 42 is complementary to 23. O mz1 = m42 Prove: mz1 = mz3 O mz1 + m42 = 90 O mz2 = m23 O mz2 + m23 = 180a 3 Statements Reasons 1 41 is comp. to 22 given 2. Z2 is comp. to 23 2. given 3 def. of comp. 4s 4 m21=90 -mz2 4. subtr. equality prop 5. m_2+m23=90 5. def. of comp. Zs 6. m23=90 -mZ2 6 subtr, equality prop 7 m_1= m23 7. trans prop