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1.有一个角是直角的平行四边形叫做矩形.它的特殊性质有:(1)矩形的四个角都是直角;(2)矩形的对角线相等.判定一个四边形是矩形的方法有:(1)定义;(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.2.有一组邻边相等的平行四边形叫做菱形.它的特殊性质有:(1)菱形的四条边都相等;(2)菱形的对角线互相垂直,并且每一条对角线平分一组对角.
1. A rectangular parallelepiped with a corner is called a rectangle. Its special properties are: (1) The four corners of the rectangle are all right angles; (2) The diagonals of the rectangles are equal. The way to determine if a quadrangle is rectangular is: (1) Definition; (2) Quadrilateral with three corners at right angles is rectangular; (3) Parallelogram with equal diagonal is rectangle. 2. There is a set of parallelogram whose adjacent sides are equal and called rhombus. Its special properties are: (1) The four sides of the diamond are equal; (2) The diagonals of the rhombus are perpendicular to each other, and each diagonal bisects a set of diagonals.