Average distance planar circle to point 3d maybe

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There is a 3d space, x, y and z, a point Q and a circle on a plane with center P and any number of outer points may be defined and area and radius are known and Ax+By+Cz=D is all known and a local 2d coordinates system on plane is defined, x0, y0, and we can convert between 3d and 2d coordinates for anything on plane but Q may not be on plane, how to determine average distance of Q from circle with center P's points, all of them? Does say P1 is x on plane way from P and P2 like y with that help? Can you connect with me, maybejosiah@aol.com if you answer?