6 The equation of a plane \(\Pi\) is \(x - 2 y - z = 30\).
- Find the acute angle between the line \(\mathbf { r } = \left( \begin{array} { c } 3
2
- 5 \end{array} \right) + \lambda \left( \begin{array} { r } - 5
3
2 \end{array} \right)\) and \(\Pi\). - Determine the geometrical relationship between the line \(\mathbf { r } = \left( \begin{array} { l } 1
4
2 \end{array} \right) + \mu \left( \begin{array} { r } 3
- 1
5 \end{array} \right)\) and \(\Pi\).