SOLUTION: what postulate or therom states that BD=BD?

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Question 681937: what postulate or therom states that BD=BD?
Found 2 solutions by Edwin McCravy, Onmyoji.S:
Answer by Edwin McCravy(20081) About Me  (Show Source):
You can put this solution on YOUR website!
Reflexive Property of Equality

Answer by Onmyoji.S(32) About Me  (Show Source):
You can put this solution on YOUR website!
BD=BD reflex of prop are congruence