A new proof of Yun's inequality or bicentric quadrilaterals - Martin Josefsson We give a new proof of a recent inequality for bicentric quadrilaterals that is an extension of the Euler-like inequality R \ge \sqrt 2 r. ✪ ✪ ✪ ✪ ✪ Link tải tài liệu: LINK TẢI TÀI LIỆU Theo LTTK Education