9 A circle with centre \(C\) has equation \(( x - 2 ) ^ { 2 } + ( y + 5 ) ^ { 2 } = 25\).
- Show that no part of the circle lies above the \(x\)-axis.
- The point \(P\) has coordinates \(( 6 , k )\) and lies inside the circle. Find the set of possible values of \(k\).
- Prove that the line \(2 y = x\) does not meet the circle.