An improved inequality for the perimeter of a quadrilateral - Elliott A. Weinstein and John D. Klemm We demonstrate that a new inequality for the perimeter of a quadrilateral is strict even in the nonconvex case. ✪ ✪ ✪ ✪ ✪ Link tải tài liệu: LINK TẢI TÀI LIỆU Theo LTTK Education