$\"\"$

The initial point is $\"\"$ and the magnitude of the vector $\"\"$ .

Consider the terminal point of the vector as $\"\"$ .

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

If $\"\"$ is a vector with initial point $\"\"$ and terminal point $\"\"$ then the magnitude of the vector $\"\"$ is given by $\"\"$ .

$\"\"$

Squaring on each side.

$\"\"$

Assume $\"\"$ .

$\"\"$

One possible terminal point is $\"\"$ .

$\"\"$

One possible terminal point is $\"\"$ .