Require Export GeoCoq.Elements.OriginalProofs.euclidean_tactics.
Section Euclid.
Context `{Ax:euclidean_neutral}.

(* Specifications: *)
Lemma lemma_3_6a :
forall A B C D,
BetS A B C -> BetS A C D ->
BetS B C D.
Lemma lemma_TCreflexive :
forall A B C,
Triangle A B C ->
Cong_3 A B C A B C.
Lemma lemma_congruencesymmetric :
forall A B C D,
Cong B C A D ->
Cong A D B C.
Lemma lemma_equalitysymmetric :
forall A B,
eq B A ->
eq A B.