7 The line \(l _ { 1 }\) passes through the points \(A ( - 3,1,4 )\) and \(B ( - 1,5,9 )\). The line \(l _ { 2 }\) passes through the points \(C ( - 2,6,5 )\) and \(D ( - 1,7,5 )\).
- Find the shortest distance between the lines \(l _ { 1 }\) and \(l _ { 2 }\).
- Find the acute angle between the line \(l _ { 2 }\) and the plane containing \(A , B\) and \(D\).