\"\"

\

The vertices are \"\", \"\", \"\" and \"\".

\

Determine the quadrilateral \"\" is a parallelogram.

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For a parallelogram \"\".

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Find \"\".

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\"\"

\

Find \"\".

\

\"\"

\

\"\"

\

Hence, \"\" So, \"\" is a not parallelogram.

\

\"\"

\

\"\" is a not parallelogram.