End Book_1_prop_1_euclidean.
Section Book_1_prop_1_circle_circle.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

(* Specifications: *)
Lemma prop_1_circle_circle : circle_circle ->
forall A B, exists C, Cong A B A C /\ Cong A B B C.