A Feuerbach type theorem on six circles - Lev Emelyanov According to the famous Feuerbach theorem there exists a circle which is tangent internally to the incircle and externally to each of the excircles of a triangle. This is the nine-point circle of the triangle. We obtain a similar result by replacing the excircles with circles each tangent internally to the circumcircle and to the sides at the traces of a point. ✪ ✪ ✪ ✪ ✪ Link tải tài liệu: LINK TẢI TÀI LIỆU Theo LTTK Education
