Linked from
The 18 pages that link to Plane (geometry), each with the reason it gives.
Great circleRelated: A plane through the sphere’s center cuts out a great circle.
Parallel linesRelated: The definition requires both lines to lie in the same plane.
Point (geometry)Related: Three noncollinear points determine a unique plane in Euclidean geometry.
Skew linesRelated: Skew lines occupy different planes, unlike coplanar line pairs.