教材内容分析:北师大版六年级上册《圆的面积》这部分内容是直观几何的最后阶段,它既是前面所学直观地认识平面图形及有关计算的延续和发展,又为今后逐步由实验几何阶段转入论证几何阶段作了渗透和准 Content of the textbook analysis: Beijing Normal University version sixth grade on the volume “circle area” This part of the content is the final stage of visual geometry, which both learned in front of the plane graphics and related computing continuity and development, but also for the future by the experiment Geometry stage into the geometric phase of argument made penetration and standard