Require Export GeoCoq.Meta_theory.Parallel_postulates.parallel_postulates.
Require Export GeoCoq.Meta_theory.Parallel_postulates.par_trans_NID.
Section T13.
Context `{TE:Tarski_euclidean}.

Lemma par_trans : forall A1 A2 B1 B2 C1 C2,
Par A1 A2 B1 B2 -> Par B1 B2 C1 C2 -> Par A1 A2 C1 C2.