生活中的平移版本3.ppt

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1、殷剑炜,生活中的平移,|we did professional work,平移定义,平移性质,课堂练习,平移,你发现了什么？,|we did professional work,平移定义,平移性质,课堂练习,滑 梯,|we did professional work,平移定义,平移性质,课堂练习,大厦里的电梯,|we did professional work,平移定义,平移性质,课堂练习,推拉窗,|we did professional work,平移定义,平移性质,课堂练习,平移实例,Services,平移,在平面内，将一个图形沿某个方向移动一定的距离，这样的图形运动称为平移。,平移的两个

2、要素：方向；距离。,|we did professional work,平移定义,课堂练习,平移实例,Services,Services,A,B,C,D,|we did professional work,平移定义,课堂练习,平移实例,Services,我们发现：（1）四边形ABCD与四边形EFGH全等；,（2）线段AE、DH、CG、BF平行且相等。,|we did professional work,平移定义,课堂练习,平移实例,Services,图形平移的性质：,1.不改变图形的形状、大小，改变的只是图形的位置。平移前后的两个图形全等。,2.平移前后两个图形的对应点的连线平行且相等。对应线

3、段平行且相等，对应角相等。,|we did professional work,平移定义,平移性质,课堂练习,平移实例,Services,A B C D E,下列5幅图中，哪些图可以通过平移A得到？,A B C D E,|we did professional work,平移定义,平移性质,课堂练习,平移实例,Services,在图形平移中，下面说法中错误的是（）.A.图形上每一点移动的方向相同 B.图形上每一点移动的距离相等 C.图形上每对对应点的连线长度相等 D.图形上可能存在不动点,D,|we did professional work,平移定义,平移性质,课堂练习,平移实例,Servi

4、ces,如图，在正方格纸上将ABC先向右平移6格，再向上平移2格，得到平移后的DEF，连接平移前后的对应点，找出图中几组平行且相等的线段、几组相等的角和一组全等三角形，并说明理由。,|we did professional work,平移定义,平移性质,课堂练习,平移实例,Services,|we did professional work,平移定义,平移性质,课堂练习,平移实例,Services,（1）4组线段AB和DE、BC和EF、AC和DF 以及线段AD、BE和CF，分别平行且相等（2）3对角对应相等：A=D、B=E、C=F（3）ABC DEF,|we did professional

5、work,平移定义,平移性质,课堂练习,平移实例,Services,练习 将图中小船向左平移4格。,NO.1,NO.2,NO.3,|we did professional work,平移定义,平移性质,课堂练习,平移实例,Services,练习 将图中小船向左平移4格。,NO.1,NO.2,NO.3,|we did professional work,平移定义,平移性质,课堂练习,平移实例,Services,练习 将图中小船向左平移4格。,NO.1,NO.2,NO.3,|we did professional work,平移定义,平移性质,课堂练习,平移实例,Services,思考 邻居陈大伯

6、在自家的后院围了一块长方形地，长30米，宽25米，如图，准备种菜，为行走方便，修了两条互相垂直的小路，各宽1米，你能帮助他计算种植蔬菜的面积吗？,NO.1,NO.2,|we did professional work,平移定义,平移性质,课堂练习,平移实例,Services,（30-1）米,（25-1）米,S=（30-1）*（25-1）=696（平方米）,方案一：,NO.1,NO.2,|we did professional work,平移定义,平移性质,课堂练习,平移实例,Services,（30-1）米,（25-1）米,S=（30-1）*（25-1）=696（平方米）,方案二：,NO.1,

7、NO.2,|we did professional work,平移定义,平移性质,课堂练习,平移实例,Services,思考：,（a-x）米,（b-y）米,b米,a米,S=（a-x）*（b-y）,|we did professional work,平移定义,平移性质,课堂练习,平移实例,思考：如图是一块长方形的草地,长为21米.宽为15米 在草地上有一条宽为1米的小道,长方形的草地上除小道外长满青草。求长草部分的面积为多少?,|we did professional work,平移定义,平移性质,课堂练习,平移实例,今天我学到了,|we did professional work,平移定义,平移性质,课堂练习,平移实例,作,业,谢 谢！,Qiying,