Three Pappus chains inside the arbelos: some identitites - Giovanni Lucca We consider the three different Pappus chains that can be constructed inside the arbelos and we deduce some identities involving the radii of the circles of n-th order and the incircle radius. ✪ ✪ ✪ ✪ ✪ Link tải tài liệu: LINK TẢI TÀI LIỆU Theo LTTK Education