《五年级数学上册平行四边形的面积2课件冀教版》由会员分享，可在线阅读，更多相关《五年级数学上册平行四边形的面积2课件冀教版（11页珍藏版）》请在金锄头文库上搜索。
1、冀教版五年级数学上册Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.教学目标1.知识与技能：（1）知道平行四边形的面积 公式推导过程；（2）会用平行四边形面积 公式计算平行四边形的面积。
2、2.过程与方法：经历动手操作、讨论、归纳 等探索平行四边形面积公式的过程。 3.情感、态度与价值观：积极参加数学活动 ，体验平行四边形面积公式推导的探索性 和挑战性，感受公式的确定性和转化的数 学思想。Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copy
3、right 2004-2011 Aspose Pty Ltd.猜一猜：平行四边形的面积与它的什么有关？比较下面图形的面积。Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.沿着平行四边形的一
4、条高剪开平移到另一边 可以得到一个长方形。动手试一试。1.拼成的长方形与原来的平行四边 形有什么关系？2.你能根据这些关系得出平行四边 形的面积公式吗？Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pt
5、y Ltd.拼成的长方形的长和平行四边形的_相等， 拼成的长方形的宽和平行四边形的_相等。底高因为 长方形的面积=长宽,所以 平行四边形的面积=底高它们的面积相等Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspo
6、se Pty Ltd.试一试：算出下面每个平行四边形的面积4厘米3厘米3.5分米5分米1.5米3米Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.你能用几种方法计算出下面平行四边 形的面积
7、？试一试。30cm18cm 20cm27cm Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.14.38=114.4114（平方米）答：这块地的面积大约是115平方米。1.一块地近似平行四
8、边形底是14.3 米，高是8米。这块地的面积是多 少平方米？（得数保留整数）8米练习Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.2.自己做一个活动的平行四边形木条框。拉 一拉，观察平行
9、四边形的底和高是否发生 了变化，面积变了吗？3.下面两个平行四边形的面积相等吗？为什么？ Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.思考 把平行四边形剪一刀，分成两个完全一样的把平行
10、四边形剪一刀，分成两个完全一样的 三角形。想一想三角形的面积怎样计算？三角形。想一想三角形的面积怎样计算？Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.本课小结本课小结1.1.知道平行四
11、知道平行四边边边边形的面形的面积积积积公式推公式推 导过导过导过导过 程；程； 2.2.会用平行四会用平行四边边边边形面形面积积积积公式公式计计计计算算 平行四平行四边边边边形的面形的面积积积积。Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.
