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It's a proof and there's a fill in the blank reason.

It's a proof and there's a fill in the blank reason.-example-1
User Orangutech
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A line bisects an angle if it cuts it into two congruent angles. Since the line segment BD forms the angles <4 and <3, and these angles have the same magnitude the postulate that proves this is the definition of an angle bisector

User Aashish Upadhyay
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