Σάββατο 17 Μαρτίου 2012

HOW THEY DO GEOMETRY IN CHINA

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CYCLOLOGIC

Let ABC be a triangle Denote 1. Oa, Ob, Oc = the circumcenters of HBC, HCA, HAB, resp. ABC, OaObOc are cyclologic, since Oa, Ob, Oc...

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