Gossard's perspector and projective consequences - Wladimir G. Boskoff, Laurentiu Homentcovschi and Bogdan D. Suceava Considering as starting point a geometric configuration studied, among others, by Gossard, we pursue the projective study of a triangle in the Euclidean plane, its Euler line and its nine-point circle, and we relate Pappus' Theorem to the nine-point circle and Euler line ✪ ✪ ✪ ✪ ✪ Link tải tài liệu: LINK TẢI TÀI LIỆU Theo LTTK Education