Require Export GeoCoq.Elements.OriginalProofs.lemma_extension.
Require Export GeoCoq.Elements.OriginalProofs.lemma_betweennesspreserved.
Section Euclid.
Context `{Ax1:euclidean_neutral_ruler_compass}.

Lemma lemma_lessthancongruence :
forall A B C D E F,
Lt A B C D -> Cong C D E F ->
Lt A B E F.