The perimeter of a cevian triangle - Nicolaos Dergiades We show that the cevian triangles of certain triangle centers have perimeters not exceeding the semiperimeter of the reference triangle. These include the incenter, the centroid, the Gergonne point, and the orthocenter when the given triangle is acute angled. ✪ ✪ ✪ ✪ ✪ Link tải tài liệu: LINK TẢI TÀI LIỆU Theo LTTK Education