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三角形是最常见、最基本的几何图形之一,是认识其他图形的基础.初学三角形时,同学们会因为对本章概念认识不清、性质定理运用不当、考虑问题不周而出现各种各样的错误.下面让我们一起看看同学们在学习时常出现的错误有哪些吧.一、有关三角形一些概念认识上的错误例1下列说法正确的是().A.三角形的角平分线是射线B.三角形的高是一条垂线C.三角形的三条中线相交于一点D.三角形的中线、角平分线和高都在三角形内错解:选A或B或D.剖析:本题主要考查三角形的三种重要线段,解决的关键是明确概念.选A是混淆了一个角的平分线与三角形角平分线的本质区
Triangle is one of the most common and basic geometric figures, and is the basis for understanding other figures. When beginners’ triangles, students may find various concepts due to the unclear concepts in this chapter, improper use of the theorems of nature, The following let us take a look at the mistakes students often learn what it. First, the concept of the triangle some of the mistakes Example 1 The following is correct () .A triangle bisector is the ray B. The height of the triangle is a vertical line C. The three center lines of the triangle intersect at a point D. The center line, the angle bisector and the height of the triangle are all within the triangle. Choose A or B or D. Anatomy: The three key segments, the key to solve is a clear concept.Select A is the confusion of a corner of the bisector and triangle angle bisector of the essential area