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(* Formalization of the Chou, Gao and Zhang's decision procedure.          *)
(* Julien Narboux (Julien@narboux.fr)                                      *)
(* LIX/INRIA FUTURS 2004-2006                                              *)
(* University of Strasbourg 2008                                           *)
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(** nine point circle *)
(** another statement for nine point circle theorem *)

Lemma l_6_272 : forall A B C M E P G Q L,
is_midpoint M B C ->
on_perp_d E A B 1 ->
is_midpoint P B E ->
on_perp_d G A C (0-1) ->
is_midpoint Q C G ->
is_midpoint L E G ->
eq_distance P M L Q.