Require Export GeoCoq.Elements.OriginalProofs.lemma_8_3.
Require Export GeoCoq.Elements.OriginalProofs.lemma_8_2.
Section Euclid.
Context `{Ax:euclidean_neutral_ruler_compass}.

Lemma lemma_equaltorightisright :
forall A B C a b c,
Per A B C -> CongA a b c A B C ->
Per a b c.