面对题型众多的中考试题,我们往往眼花缭乱,给人无法下手的感觉。殊不知很多情况下,许多题目都是换汤不换药,只要能静下心来,我们都可以从复杂多变的题型中找到基本题型。在这里仅探讨复杂图形中存在的直角三角形的判定。直角三角形是比较特殊的基本图形,它的边和角都具有特殊的性质,如边的关系(勾股定理)、角的关系(两锐角互余)、边角关系(锐角三角函数)等,因而直角三角形在初中数学中占有举足轻重的地位。如何来判定 In the face of a large number of middle school entrance exam questions, we often dazzled, giving people the feeling that they can not start. Many do not know many cases, many topics are swirling, as long as we can calm down, we can find the basic types of questions from the complex and changeable. Here only to determine the complexity of the existence of the triangle triangle judgment. Right triangle is a rather special basic graph whose edges and corners all have special properties such as edge relation (Pythagorean theorem), angle relation (two interrelated acute angles), corner relation (acute trigonometric function) Thus, the right triangle occupies a pivotal position in the junior middle school mathematics. How to judge