Require Export GeoCoq.Tarski_dev.Ch10_line_reflexivity_2.
Section PerpBisect_1.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma perp_bisect_sym_1 :
forall P Q A B,
Perp_bisect P Q A B ->
Perp_bisect Q P A B.