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Mathematics
Mathematics
Problem
In parallelogram
A
B
C
D
ABCD
A
B
C
D
, diagonals
A
C
AC
A
C
and
B
D
BD
B
D
intersect at
O
O
O
. Prove that
ar
(
△
A
O
B
)
=
ar
(
△
C
O
D
)
\text{ar}(\triangle AOB)=\text{ar}(\triangle COD)
ar
(
△
A
O
B
)
=
ar
(
△
C
O
D
)
.
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