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Answer:
(b) Symmetric property of congruence
Explanation:
a) The transitive property says if a=b and b=c then a=c
b) The symmetric property says if a=b then b=a
c) The substitution property says if a=b and a=c then b=c
d) The reflexive property says a=a
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The property of congruence of interest here is the symmetric property.