（2020新）北师大版六年级下册数学课件《第4课时-图形的运动》.ppt

1、【2020新】北师大版六年级下册数学课件第4课时-图形的运动我们学过哪些关于图形的运动的知识？哪些运动我们学过哪些关于图形的运动的知识？哪些运动不改变图形的形状和大小？哪些运动只改变图形的大不改变图形的形状和大小？哪些运动只改变图形的大小，而不改变形状？小，而不改变形状？复习探究点复习探究点探究点探究点1 轴对称轴对称 我们学过哪些关于图形的运动的知识？哪些运动不改我们学过哪些关于图形的运动的知识？哪些运动不改变图形的形状和大小？哪些运动只改变图形的大小，变图形的形状和大小？哪些运动只改变图形的大小，而不改变形状？而不改变形状？重合重合对称轴对称轴常见的轴对称图形对称轴的条数：长方形有常见的轴

2、对称图形对称轴的条数：长方形有()条对条对称轴，正方形有称轴，正方形有()条对称轴，等腰三角形有条对称轴，等腰三角形有()条对称轴，等边三角形有条对称轴，等边三角形有()条对称轴，等腰梯形有条对称轴，等腰梯形有()条对称轴，圆有条对称轴，圆有()条对称轴。条对称轴。24131无数无数小试牛刀小试牛刀（源于（源于典中点典中点）1下列图案中，哪些是轴对称图形？是的在括号里下列图案中，哪些是轴对称图形？是的在括号里画画“”，不是的画，不是的画“”。2下面图形各有几条对称轴？请画出所有的对称轴。下面图形各有几条对称轴？请画出所有的对称轴。(圆画出圆画出2条即可条即可)241无数无数(画对称轴略画对称轴

3、略)3以虚线为对称轴，画出下面图形的轴对称图形。以虚线为对称轴，画出下面图形的轴对称图形。略。略。直线直线方向方向距离距离位置位置形状形状大小大小探究点探究点2 平移平移4选择。选择。(将正确答案的字母填在括号里将正确答案的字母填在括号里)(1)下面每组中的两个图形经过平移后，可以互相重合下面每组中的两个图形经过平移后，可以互相重合的是的是()。B小试牛刀小试牛刀（源于（源于典中点典中点）(2)下面图形中，不能通过基本图形平移得到的是下面图形中，不能通过基本图形平移得到的是()。D5按要求画一画。按要求画一画。(1)把圆先向右平移把圆先向右平移4格，再向下平移格，再向下平移3格。格。(2)把梯

4、形先向上平移把梯形先向上平移3格，再向左平移格，再向左平移4格。格。略。略。中心中心方向方向角度角度位置位置形状形状大小大小探究点探究点3 旋转旋转6填空。填空。(1)如图，由图如图，由图1到图到图2，是将三角形绕点，是将三角形绕点A()时针时针旋转了旋转了()。(2)如图，正六边形至少要绕点如图，正六边形至少要绕点O旋转旋转()度才能与度才能与原来的图形重合。原来的图形重合。逆逆9060小试牛刀小试牛刀（源于（源于典中点典中点）(3)从从12：00到到3：00，时针旋转了，时针旋转了()，从，从12：00到到12：30，分针旋转了，分针旋转了()。(4)如图，如图，1 kg的物品可以使指针按

5、顺时针方向旋转的物品可以使指针按顺时针方向旋转 ()，()的物品可以使指针按顺时针方向的物品可以使指针按顺时针方向旋转旋转90。90180452 kg7将三角形将三角形ABC绕绕C点顺时针方向旋转点顺时针方向旋转90，画出旋，画出旋转后的图形。转后的图形。略。略。易错辨析易错辨析8以虚线为对称轴，画出下图的轴对称图形。以虚线为对称轴，画出下图的轴对称图形。略。略。辨析辨析：画图时注意轴对称的特征，对称点到对称轴的：画图时注意轴对称的特征，对称点到对称轴的距离相等。距离相等。版权申明本文部分内容，包括文字、图片、以及设计等在网上搜集整理.版权为个人所有This article includes

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26、he contents or services of this article for personal study,research or appreciation,and other non-commercial or non-profit purposes,but at the same time,they shall abide by the provisions of copyright law and other relevant laws,and shall not infringe upon the legitimate rights of this website and i

27、ts relevant obligees.In addition,when any content or service of this article is used for other purposes,written permission and remuneration shall be obtained from the person concerned and the relevant obligee.转载或引用本文内容必须是以新闻性或资料性公共免费信息为使用目地地合理、善意引用，不得对本文内容原意进行曲解、修改，并自负版权等法律责任.Reproduction or quotati

28、on of the content of this article must be reasonable and good-faith citation for the use of news or informative public free information.It shall not misinterpret or modify the original intention of the content of this article,and shall bear legal liability such as copyright.版权申明本文部分内容，包括文字、图片、以及设计等在

29、网上搜集整理.版权为个人所有This article includes some parts,including text,pictures,and design.Copyright is personal ownership.用户可将本文地内容或服务用于个人学习、研究或欣赏，以及其他非商业性或非盈利性用途，但同时应遵守著作权法及其他相关法律地规定，不得侵犯本网站及相关权利人地合法权利.除此以外，将本文任何内容或服务用于其他用途时，须征得本人及相关权利人地书面许可，并支付报酬.Users may use the contents or services of this article for

30、personal study,research or appreciation,and other non-commercial or non-profit purposes,but at the same time,they shall abide by the provisions of copyright law and other relevant laws,and shall not infringe upon the legitimate rights of this website and its relevant obligees.In addition,when any co

31、ntent or service of this article is used for other purposes,written permission and remuneration shall be obtained from the person concerned and the relevant obligee.转载或引用本文内容必须是以新闻性或资料性公共免费信息为使用目地地合理、善意引用，不得对本文内容原意进行曲解、修改，并自负版权等法律责任.Reproduction or quotation of the content of this article must be reasonable and good-faith citation for the use of news or informative public free information.It shall not misinterpret or modify the original intention of the content of this article,and shall bear legal liability such as copyright.