Require Export GeoCoq.Tarski_dev.Annexes.saccheri.
Section Defect.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma ex_defect : forall A B C,
A <> B -> B <> C -> A <> C -> exists D E F, Defect A B C D E F.