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

Lemma lemma_angledistinct :
forall A B C a b c,
CongA A B C a b c ->
neq A B /\ neq B C /\ neq A C /\ neq a b /\ neq b c /\ neq a c.