An oriented circle can be defined by a center point. The circle is the the set of points that are in the normal plan the center.
Since it is oriented the two spherical caps at its two sides are unambiguously identified as a left cap and a right cap. This can be used to identify the interior and the exterior in a simple way by local properties only when part of a line is used to define part of a spherical polygon boundary.
@since 3.3
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