3. The parabola \(C\) has equation \(y ^ { 2 } = 18 x\)
The point \(S\) is the focus of \(C\)
- Write down the coordinates of \(S\)
The point \(P\), with \(y > 0\), lies on \(C\)
The shortest distance from \(P\) to the directrix of \(C\) is 9 units.
- Determine the exact perimeter of the triangle \(O P S\), where \(O\) is the origin.
Give your answer in simplest form.