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 cop_par_perp__perp : forall A B C D P Q, Par A B C D -> Perp A B P Q -> Coplanar C D P Q ->
Perp C D P Q.