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Triangle Relations and Inequalities 3
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Result
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Type the letter of the correct statement or reason to complete each two-column proof.

Given: ∠BCD is an exterior angle of ΔABC.
Prove: m∠BCD>m∠BAC and m∠BCD>m∠ABC
Choices:
a. m∠BCD>m∠ABC
b. m∠BAC+m∠BCD
c. m∠BAC+m∠ABC
d. Whole-Part Inequality
e. Substitution Property of Equality
f. Given

Proof:
Statements Reasons
1.
∠BCD is an exterior angle of ΔABC.
1.
2.
m∠BCD=
2. Exterior Angle Theorem
3.
m∠BCD>m∠BAC and
3.
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