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Mathematics
Mathematics
Problem
When diagonal
A
C
AC
A
C
is drawn in parallelogram
A
B
C
D
ABCD
A
B
C
D
, what is the relationship between
△
A
B
C
\triangle ABC
△
A
B
C
and
△
C
D
A
\triangle CDA
△
C
D
A
?
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