Given: yll z Prove: m<5+ m<2 + m26 = 180°
Angles Linos Statements Reasons
given
def. of
substitution
+ alternate interior angles theorem
A
M
1
2
3
y
Statements
✓ 1.4llz
✓ 2. mZ1 + m2 2 + m23 =
mZLAM
✓ 3. mZ1 + m2 2 + m23 = 180
Reasons
1. given
2. angle addition postulate
5
6
3. def. of straight angle
7 Z
B
m25+ m2 2 + m26 - 180
Intro
wous Activity
23
TA