If A B C D is a parallelogram, then pr...

If `A B C D` is a parallelogram, then prove that `a r\ (/_\\ A B D)=\ a r\ (/_\\ B C D)=\ a r\ (/_\\ A B C)=\ a r\ (/_\\ A C D)`= `1/2\ a r\ (para l l e l o g r a m A B C D)`

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