Section Archimedes_for_angles.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma acute_archi_aux : forall O A B C D E,
Per O A B -> O <> A -> B <> A -> C <> D -> D <> E ->
Bet A C D -> Bet C D E -> Bet D E B -> CongA C O D D O E ->
Lt C D D E.