Note that any vector perpendicular to 
lies in the span of 
since 
. We can take advantage of this fact to construct the "T" bar.
lies in the span of since . We can take advantage of this fact to construct the "T" bar.Suppose we want each side of our "T" bar to have length r. We can constuct a vector of length r that is perpendicular to 
via the formula 
where 
is the norm of 
.
via the formula where is the norm of .Then we can add this vector and its negative to in order to construct the endpoints of the "T" bar:
in order to construct the endpoints of the "T" bar:
