Suppose $ABCD$ is a parallelogram and $P$ is a point on the same plane as $ABCD$.
Show that the locus of points $P$ such that
$$|PA|^2 + |PB|^2 + |PC|^2 + |PD|^2 = \text{constant}$$
is either a circle or nothing, depending on the constant.
What is the radius of the circle, if the parallelogram side lengths are $L$ and $W$ and the constant is $K$?
[Solution]
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