Require Export GeoCoq.Tarski_dev.Ch10_line_reflexivity.
Section T10_1.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma image_preserves_per : forall A B C A' B' C' X Y,
Reflect A A' X Y -> Reflect B B' X Y -> Reflect C C' X Y ->
Per A B C ->
Per A' B' C'.