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本文将对给出的双心四边形的中位线定理予以证明. (?)明确起见,先给出双心四边形及其中位线的定义: 既有内切圆又有外接圆的四边形称为双心四边形.过其内心且与(?)边平行的线段(端点分别在一组对边或其延长线上)称为双心四边形的(广义)中位线. 定理 双心四选形的中位线等于任意一组对边和的一半。
In this paper, the bilinear quadratic median line theorem is given. (?) For the sake of clarity, the definition of the bicentric quadrilateral and its median line is given first: The quadrilateral with both inscribed circles and circumscribed circles is called double A quadrilateral whose line is parallel to its inner side and parallel to the (?) edge (the endpoints are on a pair of opposite sides or on an extension line) is called the (broad) median line of a bicentric quadrangle. The bit line is equal to half of the sum of any pair of edges.