$\Delta :\begin{cases} \overrightarrow{u_{\Delta }}=(a;b;c) \\ M (x_{M};y_{M};z_{M}) \end{cases}$$d: \begin{cases} \overrightarrow{u_{d}}= (a',b',c') \\ N(x_{N};y_{N};z_{N}) \end{cases}$
$d(\Delta ;d)=\frac{|[\overrightarrow{u_{\Delta} },\overrightarrow{u_{d}}]\overrightarrow{MN}|}{|[\overrightarrow{u_{\Delta }},\overrightarrow{u_{d}}]|}$