fact: Definition OnCirc P (C:Tcircle) := match C with (X,A,B) => tarski_axioms.Cong X P A B end.
imports: GeoCoq.Tarski_dev.Ch12_parallel GeoCoq.Axioms.euclidean_axioms GeoCoq.Axioms.continuity_axioms GeoCoq.Meta_theory.Continuity.elementary_continuity_props GeoCoq.Meta_theory.Parallel_postulates.parallel_postulates