Triangle Angle Theorems Instruction
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Proving the Sum of the Interior Angle Measures of a
Triangle Is 180°
Try it
Given: y ll z
Prove: m25+ m2 2 + m26 = 180°
Angle: Lines Statements Reasons
=
21
23
25
26
m21
m23
m25
mZ6
L
A
M
1
2
3
y
Statements
✓ 1.4 ||z
Reasons
1. given
4
5
6
7 Z
С
B
Correct! Assemble the next
statement