所谓“K形全等”是指,在图1中,点A、B、C在同一直线上,若BD=BE,∠DAB=∠DBE=∠BCE=90°,则△ABD≌△CEB(证明略).在正方形、等腰直角三角形中,遇到两条垂直的等长线段时,通过向过直角顶点的直线作垂线段,构造K形全等,可以有效沟通线段或角之间的联系,促进问题的解决.下面举例说明K形全等在点的坐标确定、图形面积求 The so-called “K congruent ” means that in Figure 1, points A, B, C on the same line, if BD = BE, ∠ DAB = ∠ DBE = ∠ BCE = 90 °, then △ ABD ≌ △ In the square, isosceles right triangle, when encountering two vertical equiaxed segments, by constructing a K-shape congruent to the straight line passing the right-angled vertex, the line segment or angle can be effectively communicated Between the contact, and promote the solution to the problem. The following example illustrates the K-congruent coordinates at the point of determination, graphics area seeking