On some elementary properties of quadrilaterals - Paris Pamfilos We study some elementary properties of convex quadrilaterals related to the idea of common harmonics of two pairs of points and detecting two similar parallelograms with diagonals parallel to those of the quadrilateral and such that the area of the quadrilateral is the mean geometric of their areas. We apply these results to the study of variation of area of quadrilaterals, whose angles remain fixed in measure. ✪ ✪ ✪ ✪ ✪ Link tải tài liệu: LINK TẢI TÀI LIỆU Theo LTTK Education
