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In trapezium ABCD, AB||CD and AB= (1)/(3...

In trapezium ABCD, `AB||CD` and `AB= (1)/(3)CD`. The diagonals AC and BD interset at O. If `ar (AOB)= 21 cm^(2)`, then find ar (COD).

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The correct Answer is:
`189 cm^(2)`
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