Create a circle that passes through 3 points on Modeller?

starbase1

May the sauce be with you
I often work with Ogives for rocket hulls, sections of a circle lathed around an axis.

And it occurs to me that it would be REALLY handy for accuracy if there was a way to create a circle, (or 2d disk), that passed through 3 points that define a circle.
Does anyone know of a way of doing this please? It's fine if it's flat in the X Y or Z planes, it doesn't need to work at an arbitrary angle.

Cheers,
Nick
 
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