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Mathematics
Problem
In parallelogram
A
B
C
D
ABCD
A
B
C
D
, diagonal
A
C
AC
A
C
is drawn. Which congruence criterion shows that
△
A
B
C
\triangle ABC
△
A
B
C
and
△
C
D
A
\triangle CDA
△
C
D
A
are congruent? Give a brief reason for your answer.
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