Let H be the orthocenter, O the circumcenter of ABC. Define A1 = AHÇBO, A2 = AHÇCO, B1 = BHÇCO, B2 = BHÇAO,  C1 = CHÇAO, C2 = CHÇBO. The triangles A1B1C1 i A2B2C2 are inversely similar, and similar to ABC.