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

Lemma defect2__conga : forall A B C D E F D' E' F',
Defect A B C D E F -> Defect A B C D' E' F' ->
CongA D E F D' E' F'.