多边形及其内角和(教学案).pdf

1/5 教 案 案集备时间：授课时间：案型：实施案科目数学课题7.3多边形及其内角和课型新授学习目标1.观察生活中大量的图片，认识一些简单的几何图形，了解多边形、正多边形及其内角、对角线等数学概念.2.能由实物中辨别寻找出几何图形，由几何图形联想或设计一些实物形状，丰富学生对几何图形的感性认识.3.了解类比这种重要的数学思想方法，体验生活中处处有数学的道理.重点了解多边形、正多边形及其内角、对角线等数学概念以及凸多边形的形状的辨别.难点对正边形的正确理解以及凸多边形的辨别.教案流程：一、看一看观察课本第79 页图 7.31，从中找出几个由一些线段围成的图形.二、说一说1.多边形的定义：。2.多边形的内角：3.多边形的外角：4.画出一个多边形（如五边形）指出它的边，内角，外角。2.提出新知：多边形的对角线.3.请同学们画出四边形、五边形、六边形从一个顶点出发的对角线，它把这个多边形分成了几个三角形？导学说明反思生 活 中 有 很多多边形.类 比 三 角 形从 定 义、边、内 角、外 角 方 面 了解多边形.写 出 对 角 线的概念.密封线主备人：授课人：班级：七年级班学生姓名：2/5 三、.请同学们画出四边形、五边形、六边形所有的对角线，填表。定义（说一说）边（条数）内角（个数）外角（个数）对角线（条数）三角形四边形五边形六边形n 边形四.辨一辨1.下面两个四边形有什么区别？2.什么是凸多边形？3.归纳判别凸多边形的方法.导学说明反思运用类比方法学习新知识，便于发现新旧知 识 的 异 同点，同时能完善自己的认知结构.从边和内角两个角度来归纳.文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I93/5 4.下列图形哪些是凸多边形，哪些是凹多边形？5.什么是正多边形？6.判断：正多边形一定是凸多边形吗？凸多边形一定是正多边形吗？小结：1.写出 本节中的主要概念.2.本节课学习新知识过程中运用了哪种重要的思想方法.3.生活中处处有几何.达标测试1.如图，下列不是凸多边形的是（）2.从 n 边形的一个顶点出发，可以引（）对角线。An B.n-2 C.n-3 D.n+3 3.n 边形有个内角，个外角。4.在正六边形ABCDEF 中，A=120，AB=4cm，则 D=，DE=。导学说明反思各 外 角 都 相等，各 边 都相 等，两 个条 件 缺 一 不可.画 出 图 形，按 要 求 回 答问题.A B C D 文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I94/5 5.正六边形六个内角和为720 为，它的一个外角是多少度？6.（选做）若m 边形的一个顶点有7 条对角线，n 边形没有对角线，k 边形共有k条对角线，则（m-k）n为多少？反思问老师我有问题教案反思密封线文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 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ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9文档编码:CA6W2V8P3P1 HQ2S5F1Y3K9 ZT10D1B1V9I9