The golden ratio and regular polygons - Manfred Pietsch We give a simple construction of a chord of the circumcircle of an isosceles triangle whose intersections with the legs of the triangles divide symmetrically the chord in the golden ratio. ✪ ✪ ✪ ✪ ✪ Link tải tài liệu: LINK TẢI TÀI LIỆU Theo LTTK Education