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1、圆的认识教学设计城关二小杨菊莲教学内容：教材第页的内容及练习。教学目标：1、使学生认识圆，掌握圆的特征；了解圆的各部分名称。2、会用字母表示圆心、半径、直径；理解并掌握在同圆（或等圆）中直径与半径的关系。3、能正确熟练地掌握用圆规画圆的操作步骤。4、培养学生动手操作、主动探究、自主发现、交流合作的能力。教学重难点:了解圆各部分的名称，理解并掌握圆的特征探究圆内的直径与半径的关系。教学方法：自主探究，合作交流教学准备:多媒体课件学生准备圆形物体和圆形纸片教学过程：一、导入新课（1）师生对话教师：日常生活中或周围的物体上哪里有圆？学生：在钟面、圆桌、人民币硬币上,都有圆。教师：请同学们用手摸一摸，
2、体会一下有什么感觉？学生用眼看一看、用手摸一摸，感觉：,闭封的、弯曲的。教师（多媒体演示：圆形物体圆）：这（指圆）和我们以前学过的平面图形，有什么不同呢？学生：以前我们学过的平面图形如长方形、正方形、三角形、平行四边形和梯形的共同特征，都是由线段围成的直线图形。而我们现在看到的（指圆）这种图形是由曲线围成的图形。教师（鼓励表扬学生）：对，这个图形就是圆，你能说说什么是圆吗？学生讨论后回答：圆是平面上的一种曲线图形。（这时，教师请同学们把眼睛闭上，在脑子里想圆的形状，睁开眼睛再看一看，再闭上眼睛想一想，能否记住它。）教师在此基础上揭示课题，并请学生回答：你还想认识圆的什么？学生说：还想认识圆的圆
3、心、直径、半径,这里通过生生交流、师生互动，形象感知、抽象概括，帮助学生正确建立“圆”的概念。二、探索新知。（2）探究圆的直径、半径及其关系。教师：你还想知道什么？学生：还想知道圆的直径、半径，直径与半径之间有什么关系？,分组探究，合作学习。教师提出学习活动要求：（课件出示要求，让学生一步步完成，在汇报交流）通过动手“折、量、画、数、比（估）、看、议”等方法。操作检验，内化提升。a.考考你的判断力。（课件出示判断圆内的哪些线段是半径或直径）动手量一量自己圆中的半径和直径，你发现了什么？学生汇报交流，教师演示。或板书b.对答游戏（每两个学生一组）：你说直径长度，我答半径长度；你说半径长度，我答直
4、径长度。文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档
5、编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1
6、I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5
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8、U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U
9、8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV
10、10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1c.边体验，边说理：为什么车轮都要做成圆的，车轴应安装在哪里？（教师提供各种车轮形状和安装位置不一样的自行车玩具，让学生边操作边体验，进而明理。）d.合作操作探
11、索。画一画、量一量、比一比、找一找：在同圆中所有的线段（）最长；你能用尺（直尺、三角板）测量没有标出圆心的圆的直径吗？三、巩固提高1、判断题2、选择题3、填空四、探究圆的画法 徒手画圆。教师请两个学生一同在黑板上徒手画圆，然后请同学们评一评（3 个人）谁画的圆好呢？,师生认为用工具画圆才能画得好。师生共同表演、平等相待、大家评说、其乐融融。用工具画圆。教师请同学们用自己喜欢的工具画圆。学生画圆：a.用圆规画圆；b.用圆形物体画圆。用圆规画圆。学生自学：用圆规画圆的方法和步骤。（课本第87 页）学生操作：用圆规画圆。（自我体会，怎样才能画对、画好。）汇报交流。教师根据学生的学习、操作情况指导学生
12、汇报并总结。适时板书：a.定长（即半径）b.定点（即圆心）文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH
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14、U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 Z
15、V10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R
16、3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文
17、档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ
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19、，你发现了什么？）B按要求画圆，并观察你发现了什么？（教师请学生画3 个同心圆、3 个大小不等的非同心圆。引导学生观察、讨论、比较并归纳：圆心决定圆的位置；半径决定圆的大小。）C体育老师在操场上的圆怎样画？（学生讨论，全班交流。）五、课堂小结。教师启发学生自我小结本节课的学习收获：知道了什么？怎么知道的？鼓励学生质疑：你还想知道什么？,4、创新思维训练游戏。教师：一个圆很美，大小不同的圆在一起组成美丽的图案更美。请大家设计由圆（或圆和其它平面图形）组成的图案，并写出创意，带到学校与同学交流。文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7
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25、K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码
26、:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1课后反思。新课程倡导学生主动参与、乐于探究、勤于动手的学习方式，培养学生收集和处理信息的能力、获取新知识的能力、分析和解决问题的能力，以及交流与合作的能力。本节课教师通过创设宽松、愉悦、民主、和谐的课堂教学氛围，引导学生积极主动参与学习活动。如通过“游戏活动”，让学生在“
27、玩”中学习。如“游戏趣味题”中“教师的评说”，能唤起学生学习的热情。如“自我习作、操作表演、大家共赏”，享受成功的愉悦，可激发学生探知的欲望。如让学生剪、折、画、量、议、找,多种感官参与活动，可培养学生的动手、实践能力，学会探索的方法。如通过学生评价教师、学生，师生平等相待，可解放学生的脑、手、眼，让学生大胆地想、放开去说、随心地做，有利于培养学生的创新精神和探究能力。教学中师生互动、生生互动、民主平等、开放自由、心心相映、情感交融,课堂充满了生命活力，这样教学有力地促进了学生学习方式的改变。置身于这样的学习情境之中，真正达到了“让学生享受学习”的意境。文档编码:CJ1I7T9S5A1 HH5
28、U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U
29、8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV
30、10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3
31、Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档
32、编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1
33、I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1文档编码:CJ1I7T9S5A1 HH5U4E10U8K9 ZV10K1R3Z9K1