Τρίτη 28 Φεβρουαρίου 2012

Concyclic Os


Let ABC be a triangle and P a point.


For which P's the circumcenters O,Oa,Ob,Oc of ABC, PBC, PCA, PAB, resp. are concyclic?

APH, 28 February 2012

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Douglas Hofstadter, FOREWORD

Douglas Hofstadter, FOREWORD In: Clark Kimberling, Triangle Centers and Central Triangles. Congressus Numerantum, vol. 129, August, 1998. W...