Require Export GeoCoq.Elements.OriginalProofs.lemma_equalanglestransitive.
Section Euclid.
Context `{Ax:euclidean_neutral_ruler_compass}.

(* Specifications: *)
Lemma lemma_angleorderrespectscongruence2 :
forall A B C D E F a b c,
LtA A B C D E F -> CongA a b c A B C ->
LtA a b c D E F.
Lemma lemma_RTcongruence :
forall A B C D E F P Q R,
RT A B C D E F -> CongA A B C P Q R ->
RT P Q R D E F.