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Mathematics
Problem
In a parallelogram
A
B
C
D
ABCD
A
B
C
D
, the diagonal
A
C
AC
A
C
is drawn. Which pair of triangles is always congruent? a)
△
A
B
C
\triangle ABC
△
A
B
C
and
△
B
C
D
\triangle BCD
△
B
C
D
b)
△
A
B
C
\triangle ABC
△
A
B
C
and
△
A
B
D
\triangle ABD
△
A
B
D
c)
△
A
B
C
\triangle ABC
△
A
B
C
and
△
C
D
A
\triangle CDA
△
C
D
A
d)
△
A
B
D
\triangle ABD
△
A
B
D
and
△
C
D
B
\triangle CDB
△
C
D
B
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