$\"\"$

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The end points are $\"\"$ and $\"\"$ .

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The distance between the points $\"\"$ and $\"\"$ is $\"\"$ .

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Let the points are $\"\"$ and $\"\"$ .

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Distance between the points is $\"\"$ .

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$\"\"$

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$\"\"$

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The mid point $\"\"$ of $\"\"$ is $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .