论文部分内容阅读
在初三第二轮专题复习中,我们经常会见到这样的题,第(1)问的图形是正方形或等边三角形,到了第(2)问或者第(3)问的图形就换成了矩形、菱形或等腰三角形,于是我们的证明过程由证全等变成了证相似.因为正方形的四条边相等,而矩形只有对边相等;正方形的对角线相等,而一般菱形没有对角线相等,等边三角形三边都相等,而等腰三角形只有两腰相等,所以在
In the second round of the third special review of the third day, we often encounter such a question. The graphic asked in paragraph (1) is a square or an equilateral triangle, and the graphic in question (2) or (3) Rectangular, rhomboid or isosceles triangle, and so our proof process turns from card equivalence to card similarity because the four sides of the square are equal and the rectangles are equal to the sides, the diagonals of the squares are equal, and the general rhombus has no diagonal The line is equal, the equilateral triangle is equal on three sides, and the isosceles triangle is equal on both sides, so at