近年来,数量积的问题常常会出现在一些高考题的小题中,而且常考常新,很多时候会和平面几何的知识结合在一起进行考查.例如与三角形的外接圆结合在一起就是一个热点问题.很多同学在高考那紧张的时刻感到无从下手,如果我们能够充分地利用数量积的几何意义,将能使问题得到很快的突破. In recent years, the number of product problems often appear in some college entrance examination questions, and often test new, often combined with the knowledge of plane geometry to examine for example with the circumscribed circle of the triangle is a Many students feel that they can not get started in the tense moment of college entrance examination. If we can make full use of the geometric meaning of quantity and quantity, we will be able to get a quick break through.