In the given figure, if \( l \| m \) and quadrilaterals \( A B C D \), \( C D E F \) and \( E F ...

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In the given figure, if \( l \| m \) and quadrilaterals \( A B C D \), \( C D E F \) and \( E F G H \) are parallelograms, then prove that \( \operatorname{ar}(\| \operatorname{gm} A B C D)=\operatorname{ar}(\| \operatorname{gm} E F G H) \).
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