Require Export GeoCoq.Elements.OriginalProofs.proposition_06a.
Require Export GeoCoq.Elements.OriginalProofs.lemma_trichotomy1.
Section Euclid.
Context `{Ax:euclidean_neutral_ruler_compass}.

Lemma proposition_06 :
forall A B C,
Triangle A B C -> CongA A B C A C B ->
Cong A B A C.