DE is the perpendicular drawn from D of ...

DE is the perpendicular drawn from D of the parallelogram ABCD to its side AB and BF is the perpendicular drawn from B of ABCD to its side AD. If AB = 10cm, AD = 8 cm and DE = 6 cm, then find BF.

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CALCUTTA BOOK HOUSE-THEOREMS ON AREAS-EXERCISE-3

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