- The circle \(C\), with centre \(A\), has equation
$$x ^ { 2 } + y ^ { 2 } - 6 x + 4 y - 12 = 0$$
- Find the coordinates of \(A\).
- Show that the radius of \(C\) is 5 .
The points \(P , Q\) and \(R\) lie on \(C\). The length of \(P Q\) is 10 and the length of \(P R\) is 3 .
- Find the length of \(Q R\), giving your answer to 1 decimal place.
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