12. Complete the proof.
Given: Z1 is supplementary to 22;m/3+m24 = 180°; m/2 = m24
Prove: 2123
1
2
1. D.
4
Statements
Reasons
1. Z1 is supplementary to 22; m23+ m24 = 180°; m/2 = m/41. Given
2. Z3 is supplementary to 24
3.
4.Z123
2. a
3. Def. of congruent angles
4.
a. Def. of supplementary angles
b. m21+ m/2 = 180°
c. Supplements Theorem
d. m22+m/3 = 180°
e. Z224
