$\"\"$

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

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

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

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

$\"\"$

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

Mid point $\"\"$ .

$\"\"$ .

$\"\"$

$\"\"$ ; $\"\"$ .