ADGEOM 971 = ADGEOM 1976 * ADGEOM 1977

******************** #971= #1976********************

Dear Mr.Yiu, Mr Moses, and Mr Francisco Javier and all Members

Let ABC be a triangle, F+, F- are first and second Fermat points.

Denote:

F_{+N}, F_{-N} respectively are reflection of First and second Fermat point on Nine point circle

F_{+O}, F_{-O} respectively are reflections of First and second Fermat point on  Circumcircle (ABC)

Then six points:

F+, F-, F_{+N}, F_{-N}, F_{+O}, F_{-O} lie on a circle

Best regards

Sincerely

Dao Thanh Oai

 

  ******************** #1977********************

Dear Dao,

the center of this circle is X1637.

Best regards ,

Francisco Javier.