特殊平行四边形复习之学霸笔记

• 作 者: 唐煌
• 出 处: 初中生辅导
• 发表日期: 2016年27期
• 关键词: 轴对称图形 邻边 角平分线 说明理由 可证 典型例题

【知识梳理】一、矩形的性质与判定1.定义:有一个角是直角的平行四边形是矩形.2.性质:(1)矩形的四个角都是直角;(2)矩形的对角线互相平分且相等;(3)矩形既是轴对称图形,又是中心对称图形,它有两个对称轴,它的对称中心是对角线的交点.3.判定:(1)有一个角是直角的平行四边形是矩形;(2)有三个角是直角的四边形是矩形;(3)对角线相等的平行四边形是矩形.二、菱形的性质或判定1.定义:有一组邻边相等的平行四边形是菱形.

【Knowledge combing】 First, the nature of the rectangle and the decision 1. Definition: a corner is a rectangular parallelogram is a rectangle 2. Nature: (1) the four corners of the rectangle are right angles; (2) the diagonal of the rectangle Equal to each other and equal; (3) the rectangle is both axisymmetric and centrosymmetric graphics, it has two axes of symmetry, its center of symmetry is the intersection of diagonal .3 determine: (1) there is a corner is a right angle Of the parallelogram is a rectangle; (2) the three corners are rectangular quadrilateral is a rectangle; (3) diagonal parallelogram is a rectangle. Second, the nature of the diamond or decision 1. Definition: There is a parallel set of adjacent parallel Quadrilateral is a diamond.