The parallel lines are AB,CD.

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Say the points :

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$\"\"$

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$\"\"$

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Slope : $\"\"$ .

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$\"\"$

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$\"\"$

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Say the points :

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Slope of the Parallel lines is equal.

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So, $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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Therefore,the value of $\"\"$ .