+214'(37+2V 'ya+2w'a(3=o, it is readily seen that for by the relation Ea 2 (p - q) (p - r) = 4 0 2 (see Geometry: Analytical, which is generally written lap, bq, cr} 2 = 4 z.
This equation, which may be more conveniently written tap, bq, cr} 2 = (Ap+pq+vr) 2 , obviously represents a circle, the centre being Xp+µqt-vr=o, and radius 20/p(X+µ+v).
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