Proving the Sum of the Interior Angle Measures of a Triangle Is 180°
Try it
Given y llz
Prove: m<5+ m<2 + m<6 = 180°
Angles Lines Statements Reasons
IN
=
y
А
M
3
2
Y
Statements
✓ 1. y || 2
✓ 2. 23-26
Reasons
1. given
2. alternate interior angles theorem
4.
5
6 7 z
C
B
Hint
h
O

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