What is the missing statement in step 3 of the proof?
Given. Z1 is complementary to 22.
22 is complementary to 23.
Prove mZ1 = m23
mz1 = m_2
m21 + m22 = 90°
m22 = m23
111222 + m23 = 180°
OWN
Statements
1. 21 is comp to 22
2. 2 is comp to 23
3. ?
4 m21-90°-m22
5. m 2+m_3=90°
6. m_3=90°-m22
7. m21-m_3
Reasons
1. given
given
3. def. of comp. ZS
subtr. equality prop
5. def. of comp. 25
6 subtr. equality prop
7 trans. prop