proposition: Lemma prop_8 : forall A B C D E F, A <> B -> A <> C -> B <> C -> Cong A B D E -> Cong A C D F -> Cong B C E F -> CongA B A C E D F /\ CongA A B C D E F /\ CongA B C A E F D.
proof: Proof. apply l11_51. Qed.
imports: GeoCoq.Meta_theory.Continuity.elementary_continuity_props GeoCoq.Tarski_dev.Ch16_coordinates_with_functions