Section T15.
Context `{T2D:Tarski_2D}.
Context `{TE:@Tarski_euclidean Tn TnEQD}.
(** Lemma 15.2 *)
(** Cong corresponds to length equality.*)
(** Le corresponds to length inequality.*)
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Lemma lta_out_lta : forall A B C D E F A' C' D' F', Out B A A' -> Out B C C' -> Out E D D' -> Out E F F'
-> LtA A B C D E F -> LtA A' B C' D' E F'.