Require Export GeoCoq.Elements.OriginalProofs.lemma_equalanglesflip.
Require Export GeoCoq.Elements.OriginalProofs.proposition_19.
Require Export GeoCoq.Elements.OriginalProofs.lemma_lessthancongruence2.
Section Euclid.
Context `{Ax:euclidean_neutral_ruler_compass}.

Lemma proposition_24 :
forall A B C D E F,
Triangle A B C -> Triangle D E F -> Cong A B D E -> Cong A C D F -> LtA E D F B A C ->
Lt E F B C.