In the given figure, ABCD and ABEF are parallelograms such that ar(quad. EABC) ` 17 cm^(2)`

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In the given figure, ABCD and ABEF are parallelograms such that ar(quad. EABC) ` 17 cm^(2)` and ar(||gm ABCD) `= 25 cm^(2)`. Then `ar(triangleBCF)` = ?
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