Ltac CopR :=
 let tpoint := constr:(Tpoint) in
 let col := constr:(Col) in
 let cop := constr:(Coplanar) in
   assert_ncols; Cop_refl tpoint col cop.

Lemma cong_midpoint__image : forall A B X Y, Cong A X A Y -> Midpoint B X Y -> Reflect Y X A B.