Require Export GeoCoq.Elements.OriginalProofs.lemma_ray3.
Section Euclid.
Context `{Ax:euclidean_neutral_ruler_compass}.

Lemma lemma_equalangleshelper :
forall A B C a b c p q,
CongA A B C a b c -> Out b a p -> Out b c q ->
CongA A B C p b q.