Require Export GeoCoq.Tarski_dev.Ch11_angles.
Section Suma_1.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma trisuma_distincts : forall A B C D E F, TriSumA A B C D E F ->
A <> B /\ B <> C /\ A <> C /\ D <> E /\ E <> F.