TMUA 2022 · Paper 2 · Question 4

The point $P$ has coordinates $(p, q)$ , and the equation of a circle is

x^{2} + 2 f x + y^{2} + 2 g y + h = 0

where $f, g, h, p$ and $q$ are all real constants.

Let $L$ be the distance between the centre of the circle and the point $P$ .

Which one of the following is *sufficient* on its own to be able to calculate $L$ ?

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