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L
4/5
C
A
1 2 3
Statements
M
6
7
B
Y
1. given
2. given
3.?
Z
Reasons
1. ABC is a triangle
2.y // z
3.21= 25; 23 = 26
4.m21=m25;m 23= m 26
4. def.
5.m21+m22+ m23=mZLAM
5. Z addition postulate
6. def. straight angle
6.m21+m22+ m23 = 180°
7.m25+ m22+ m26 = 180°
7. substitution
Which could be the missing reason in Step 3?

L 45 C A 1 2 3 Statements M 6 7 B Y 1 given 2 given 3 Z Reasons 1 ABC is a triangle 2y z 321 25 23 26 4m21m25m 23 m 26 4 def 5m21m22 m23mZLAM 5 Z addition postu class=

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