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Triangle Relations and Inequalities 3
A
B
C
D
Result
. . . .

Type the letter of the correct statement or reason to complete each two-column proof.

Prove: m∠1=m∠2+m∠3+m∠4

Choices:
a. Exterior Angle Theorem
b. Commutative Property of Addition
c. Substitution Property of Equality
d. Whole-Part Inequality
e. m∠2
f. m∠5
g. m∠1
h. m∠4

Proof:
Statements Reasons
1.
m∠1=m∠3+m∠5
1.
2.
m∠5= +m∠4
2. Exterior Angle Theorem
3.
m∠1=m∠3+m∠2+
3.
4.
m∠1 =m∠2+m∠3+m∠4
4.
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