The intial and terminal points are
and
.
Component form of a vector :
\The component form of a vector
with intial point
and terminal point
is
.
The points are
and
.
Substitute
and
in component form.

.
The component of a vector
is
.
Magnitude of the vector :
\If
is a vector with intial point
and terminal point
, then magnitude of the
is
.
The points are
and
.
Substitute
and
in magnitude of the vector form.

.
Magnitude of the vector
is
.
The component of a vector
is
.
Magnitude of the vector
is
.