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In trapezium ABCD, AB || CD and AB = 2 C...

In trapezium ABCD, AB || CD and AB = 2 CD. Its diagonals intersect at O. If the area of `Delta AOB = 84 cm^(2)`, then the area of `Delta COD` is equal to

A

`72 cm^(2)`

B

`21 cm^(2)`

C

`42 cm^(2)`

D

`26 cm^(2)`

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The correct Answer is:
B
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