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Triangle Relations and Inequalities 3
A
B
C
D
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: mBCD>mBAC and mBCD>mABC
Choices:
a. mBCD>mABC
b. mBAC+mBCD
c. mBAC+mABC
d. Whole-Part Inequality
e. Substitution Property of Equality
f. Given

Proof:
Statements Reasons
1.
BCD is an exterior angle of ΔABC.
1.
2.
mBCD=
2. Exterior Angle Theorem
3.
mBCD>mBAC and
3.
0
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