Two triangle centers associated with the excircles - Milorad Stevanovic The triangle formed by the second intersections of the bisectors of a triangle and the respective excircles is perspective to each of the medial and intouch triangles. We identify the perspectors. In the former case, the perspector is closely related to the Yff center of congruence. ✪ ✪ ✪ ✪ ✪ Link tải tài liệu: LINK TẢI TÀI LIỆU Theo LTTK Education