《讲课北师大版数学六年级上册《圆的面积》PPT课件之二》由会员分享，可在线阅读，更多相关《讲课北师大版数学六年级上册《圆的面积》PPT课件之二（35页珍藏版）》请在金锄头文库上搜索。
1、北师大版六年级数学上册,圆的面积,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,教学目标,1.知识目标：了解圆的面积的含义，经历圆面积计算公式的推导过程，掌握圆面积计算公式。 2.能力目标：能正确运用圆的面积公式计算圆的面积，并能运用圆面积知识解决一些简单实际的问题。 3.情感目标：在估一估和探究圆面积公式的活动中，体会“化曲为直”的思想，初步感受极限思想。,Evaluation only. Created
2、with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,下底,上底,高,平行四边形的面积 底 高,底,三角形的面积 底 高,高,上底,梯形的面积 （上底 下底）高,Evaluation only. Created with Aspose.
3、Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,1.已知直径怎样求圆的周长？,2.已知半径怎样求圆的周长？,3.已知半径怎样求圆周长的一半？,C=d,C=2r,r,d,你都知道圆的哪些知识？,播放,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,圆所占平面的大小叫做圆的面积。,r,d,圆的面积,你还想
4、学习圆的哪些知识？,播放,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,四等分圆,圆的面积,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,四等分圆,圆的面积,Evaluation only. Created with Asp
5、ose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,四等分圆,圆的面积,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,四等分圆,圆的面积,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0
6、. Copyright 2004-2011 Aspose Pty Ltd.,四等分圆,圆的面积,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,四等分圆,圆的面积,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,四等分圆,圆的面
7、积,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,八等分圆,圆的面积,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,八等分圆,圆的面积,Evaluation only. Created with Aspose.Slides
8、for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,八等分圆,圆的面积,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,八等分圆,圆的面积,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright
9、 2004-2011 Aspose Pty Ltd.,八等分圆,圆的面积,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,八等分圆,圆的面积,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,十六等分圆,圆的面积,Evaluati
10、on only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,圆的面积,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,圆的面积,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client
11、Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,圆的面积,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,圆的面积,十六等分圆,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Lt
12、d.,分得越细越接近长方形,曲,直,想一想,（2）长方形的宽与圆的半径有什么关系?,（1）长方形的长与圆的周长有什么关系?,播放,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,E
13、valuation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Pro
14、file 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,宽,长,圆的面积 = 长方形的面积,圆 的 面 积 =,周长的一半：,播放,= 长 宽,r,r,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,我们已经知道了圆的面积计算公式，面对一些简单的实际问题，你能解决吗？,一个圆的半径是 4 厘米。它的面积是多少平方厘米？,= 3.1416,= 50.24 （平方厘米）,
15、答：它的面积是50.24平方厘米。,播放,圆的面积,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,求下面各圆的面积。,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,圆的面积,郊区有一个圆形的渔塘，它的周长是94.2米，求渔塘
16、的面积 是多少平方米？,（1）渔塘的半径：,（2）渔塘的面积 ：,答:渔塘的面积 是706.5平方米。,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,通过测量有关数据，计算学校圆形花坛的占地面积？,课外实践活动：,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,小结,能正
