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ABCD is parallelogram and ABEF is a rect...

ABCD is parallelogram and ABEF is a rectangle and DG is perpendicular on AB.
Prove that (i) ar (ABCD) = ar(ABEF)
(ii) ar (ABCD) = `AB xx DG`

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The correct Answer is:
`thereforear(ABCD)=ar(ABEF)`
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