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

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