Given two skew lines $\displaystyle P+tD~\&~Q+tE$ then the distance between them is:
$\displaystyle \frac{{\left| {\overrightarrow {PQ} \cdot \left( {D \times E} \right)} \right|}}{{\left\| {\left( {D \times E} \right)} \right\|}}$
Given two skew lines $\displaystyle P+tD~\&~Q+tE$ then the distance between them is:
$\displaystyle \frac{{\left| {\overrightarrow {PQ} \cdot \left( {D \times E} \right)} \right|}}{{\left\| {\left( {D \times E} \right)} \right\|}}$
how do u get the lines into the form P+tD and Q+te
how do u get the lines into the form P+tD and Q+te
From the series of your questions, it seems that you are asking for a basic course in vector geometry. We are not prepared to offer instruction. You ought to have text material that contains this basic material.