Require Export GeoCoq.Elements.OriginalProofs.lemma_PGflip.
Require Export GeoCoq.Elements.OriginalProofs.proposition_34.
Section Euclid.
Context `{Ax:area}.

(* Specifications: *)
Lemma proposition_43 :
forall A B C D E F G H K,
PG A B C D -> BetS A H D -> BetS A E B -> BetS D F C -> BetS B G C -> BetS A K C -> PG E A H K -> PG G K F C ->
EF K G B E D F K H.