Require Export GeoCoq.Elements.OriginalProofs.lemma_equalanglesreflexive.
Require Export GeoCoq.Elements.OriginalProofs.lemma_angleorderrespectscongruence.
Require Export GeoCoq.Elements.OriginalProofs.lemma_crossbar.
Section Euclid.
Context `{Ax:euclidean_neutral_ruler_compass}.

(* Specifications: *)
Lemma lemma_angleordertransitive :
forall A B C D E F P Q R,
LtA A B C D E F -> LtA D E F P Q R ->
LtA A B C P Q R.