引言:人教版八年级下册数学课本中第107页最后一段是下面内容:菱形是轴对称图形,它的对角线就是它的对称轴,我们不难发现:菱形的四条边都相等;菱形的两条对角线互相垂直,并且每一条对角线平分一组对角.比较一般平等四边形的对角线和菱形的对角线,你会发现,菱形的对角线把菱形分成四个全等的小直角三角形,而一般平行四边形只被分成了全等的两对三角形,一对是锐角三角形,一对是钝角三 The last paragraph is the following paragraph: The diamond is an axisymmetric figure, its diagonal is its axis of symmetry, we can easily find: diamonds are equal to the four sides; The two diagonals of the rhombus are perpendicular to each other and each one diagonally bisects the diagonal.Comparing the diagonal of a generally equal quadrilateral with the diagonal of a diamond, you will find that the diagonal of the diamond divides the diamond into four A congruent right-angled triangle, and the general parallelogram is only divided into congruent pairs of triangles, a pair of acute triangles, a pair of obtuse angle three