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which angle property proves <bef = 107°?
select one:
a. supplementary angles
b. corresponding angles
c. interior angles
d. exterior angles

Explanation:

Supplementary angles add up to 180°. Since the angle adjacent to ∠BEF is 73°, and 73° + 107° = 180°, the property of supplementary angles proves ∠BEF = 107°.

Answer:

A. supplementary angles