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特殊四边形是指平行四边形、矩形、菱形、正方形、等腰梯形,它们的性质可以从边、角、对角线和对称性等方面进行比较理解掌握;特殊四边形的性质常常与三角形全等的知识结合在一起综合运用.一、知识要点1.平行四边形的性质:两组对边平行且相等;两组对角相等;对角线互相平分.2.矩形的性质:两组对边平行且相等;四个角都是
Special quadrilaterals refer to parallelograms, rectangles, rhombuses, squares, isosceles trapezoids, and their properties can be understood and understood from the aspects of edges, angles, diagonals, and symmetry; the nature of special quadrilaterals is often associated with the knowledge of triangles. Combine together. 1. Knowledge points 1. Properties of parallelograms: Two sets of opposite edges are parallel and equal; two sets of diagonal angles are equal; diagonal lines are equally divided. 2. Rectangle properties: Two sets of opposite edges are parallel and equal The four corners are