证明线段相等是平面几何中的常见题型,证明方法很多,证明这类题目除掌握基本方法外,必应掌握一些技巧,才能灵活证题、巧妙证题、证明综合题,从而提高证题能力。那么证明平面题常用哪些技巧呢?本文介绍四种技巧,供同学参考.一、巧用第三线段当中介这种方法的思路是要证a=b,先证a=c,再证b=c. Prove the same line segment is a common problem in plane geometry, there are many ways to prove that these topics in addition to master the basic methods, we must master some skills in order to flexibly, ingenious questions, to prove the comprehensive questions, thereby enhancing the ability of the question . Then the proof of the common problem what kind of skills? This article describes the four kinds of skills for students to reference. A clever use of the third line when the intermediary of this method is to prove a = b, first card a = c, then card b = c.