On sufficient conditions for planar convex regions to be circular disks.

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  1. If C is a planar convex region and there is a point P on its boundary such that the perpendicular bisectors of all chords to C starting at P are concurrent, then, can we assert that C is necessarily a circular disk?

  2. If C is a planar convex region and if there is a real number a such that perpendicular bisectors of all chords of C with length a are concurrent, then, can we assert that C is a circular disk?