A generalization of Droz-Farny's line theorem with orthologic triangles - Ngo Quang Duong and Vu Thanh Tung We prove a generalization of Droz-Farny's theorem with orthologic triangles. ✪ ✪ ✪ ✪ ✪ Link tải tài liệu: LINK TẢI TÀI LIỆU Theo LTTK Education