In the given figure, \( A B C D \) is a parallelogram and (W) \( E F C D \) is a rectangle, \( A...

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In the given figure, \( A B C D \) is a parallelogram and
(W) \( E F C D \) is a rectangle, \( A L \perp C D \) and \( C F \perp A B \). Prove that ar \( (\| \operatorname{gm} A B C D)=\operatorname{ar}(E F C D) \).
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