Given: Z1 is complementary to 22.
What is the missing statement in step 3 of the proof?
22 is complementary to 23.
m21 = m22
Prove: mZ1 = m 23
Om21+ m 22 = 90°
m22= m23
m22 + m 23 = 180°
von AWN-
Statements
Z1 is comp. to 22
2 22 is comp. to 23
3. ?
m21 = 90°-m22
5. mZ2+mZ3 = 90°
6. m23 = 90°-m22
mZ1 =23
Reasons
given
2. given
def. of comp. ZS
4. Subtr. equality prop
5. def. of comp. ZS
6. subtr. equality prop
7. trans prop.

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