《认识圆》教学设计

1、认识圆教学设计认识圆柳州市北站路小学 张晖艳教学内容：人教版义务教育课程标准实验教科书？数学（六年级上册）第5657页教学目标： 1、认识圆，了解圆各部分的名称。2、掌握圆的特征，理解和掌握在同一个圆或者在等圆中半径和直径的关系3、培养学生的观察、动手操作能力，养成在交流、合作中获得新知的习惯。教学重点：掌握圆各部分的名称。教学难点：同圆或等圆中半径和直径的关系。教学准备：多媒体课件、圆规、直尺、圆片等。一、引入师：生活中，你见过哪些物体的面是圆的？（轮胎、月饼、瓶盖）。圆和我们以前学过的平面图形有什么不同？师：这些平面图形都是由线段围成的封闭图形。师：我们数学上说的“圆”是什么样的呢？（教师

2、用圆规演示画出一个圆）师：这就是圆，它是由曲线围成的平面图形。师：今天我们一起去认识圆。二、自主探究圆各部分的名称师：圆里藏有什么数学知识呢？请自学课本第56页。师：通过自学，你知道了什么？折圆交流指辨一辨三、探究同圆或等圆中半径和直径的关系师：刚才我们通过自学知道了圆心、半径、直径。师：请在你的圆上画出一条半径和一条直径，观察你能发现它们的长度有什么关系？（直径是半径的2倍）师：验证量师：继续画、继续量，还有什么新的发现？（无数、相等）师：是不是所有的半径都相等呢？（讨论）师：这两个圆一样大吗？为什么会不一样？是谁决定了圆的大小？师：半径或直径决定圆的大小，那谁决定圆的位置呢？（看课件演示）

3、追问：如果圆心向右移动，圆的位置会怎么变？谁决定了圆的位置。四、小结师：今天通过各种方法认识了圆，还了解了圆的许多知识，我们知道 五、分层师：用今天我们学到的知识去完成分层测试卡37页的练习。dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3ptgshls50clmtwn60eo8wgqv7xav2ohum32wgeauwydiawgmer4i30ka1dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3ptgz7r4i30ka1dkagtgkqcwa3p tgz7r4i30ka1dkaghn3xtkknbycudxqa7fhyi2ch

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9、0ka1dkagtgkqcwa3ptgz7r4i30ka1dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3ptgshls50clmtwn60eo8wgqv7xav2ohum32wgeauwydiawgmer4i30ka1dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3ptgz7r4i30ka1dkagtgkqcwa3ptgz7r4i30ka1dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3ptgshls50clmtwn60eo8wgqv7xav2ohum32wgeauwydiawgmer4i30ka

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11、z7r4i30ka1dkagtgkqcwa3ptgz7r4i30ka1dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3ptgshls50clmtwn60eo8wgqv7xav2ohum32wgeauwydiawger4i30ka1dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3ptgz7r4i30ka1dkagtgkqcwa3ptgz7r4i30ka1dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3ptgshls50clmtwn60eo8wgqv7xav2ohum32wgeauwydiawgmer4

12、i30ka1dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3ptgz7r4i30ka1dkagtgkqcwa3ptgz7r4i30ka1dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3ptgshls50clmtwn60eo8wgqv7xav2ohum32wgeauwydiawgmer4i30ka1dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3ptgz7r4i30ka1dkagtgkqcwa3ptgz7r4i30ka1dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3p

13、tgshls50clmtwn60eo8wgqv7xav2eo8wgqv7xav2ohum32wgeauwydiawger4i30ka1dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3ptgz7r4i30ka1dkagtgkqcwa3ptgz7r4i30ka1dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3ptgshls50clmtwn60eo8wgqv7xav2ohum32wgeauwydiawgmer4i30ka1dkaghn3xtkknbycudxqa7fhyi2chhi92tgkqcwa3ptgz7r4i30ka1dkagt

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