Require Export GeoCoq.Tarski_dev.Ch10_line_reflexivity.
Section T10_1.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma ex_perp_cop : forall A B C P,
A <> B -> exists Q, Perp A B Q C /\ Coplanar A B P Q.