Require Export GeoCoq.Elements.OriginalProofs.lemma_angledistinct.
Require Export GeoCoq.Elements.OriginalProofs.lemma_layoff.
Require Export GeoCoq.Elements.OriginalProofs.lemma_equalanglesNC.
Require Export GeoCoq.Elements.OriginalProofs.lemma_equalangleshelper.
Require Export GeoCoq.Elements.OriginalProofs.proposition_04.
Section Euclid.
Context `{Ax:euclidean_neutral_ruler_compass}.

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