$\"\"$

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The points are $\"\"$ .

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So, finding the distance between two points.

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Formula to find the distance between two points.

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$\"\"$

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Distance between AB :

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$\"\"$

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Distance between CD:

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$\"\"$

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Distance between AC:

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$\"\"$

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$\"\"$

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Here $\"\"$ and $\"\"$

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Hence the points form a parallelogram.

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$\"\"$

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Hence the points $\"\"$ form a parallelogram.