课件图形的平移(2)VIP免费

3.2图形的平移（二）1.平移：在平面内，把一个图形沿着_____移动一定的_______，这样的图形运动称为平移。2.平移不改变图形的____和____。只改变图形的_____.3.平移的基本性质：一个图形和它经过平移的图形中，对应点的所连的线段____（或在一条直线上）且______；对应线段____（或在一条直线上）且____，对应角____。填一填某一方向距离形状大小位置平行相等平行相等相等123456780–1–2–3–4–512349105在直角坐标系中描出以下各点：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)并用线段依次连接,看一看是什么图案.yx写出平移后对应点的坐标(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)将这条鱼向右平移5个单位(5,0)(10,4)(8,0)(10,1)(10,-1)(8,0)(9,-2)(5,0)(x+5,y)写出平移后对应点坐标：原图形向左平移5个单位(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(-5,0)(0,4)(-2,0)(0,1)(0,-1)(-2,0)(-1,-2)(-5,0)(x-5,y)原图形向上平移4个单位，对应点坐标将如何变化(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(0,4)(5,8)(3,4)(5,5)(5,3)(3,4)(4,2)(0,4)(x,y+4)原图形向下平移4个单位，坐标将如何变化(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(0,-4)(5,0)(3,-4)(5,-3)(5,-5)(3,-4)(4,-6)(0,-4)(x,y-4)想一想•1.一个图形经过怎样的平移，对应点的横坐标增加3，纵坐标不变？•2.一个图形经过怎样的平移，对应点的横坐标减少2，纵坐标不变？•3.一个图形经过怎样的平移，对应点的横坐标不变，而纵坐标增加3？•4.一个图形经过怎样的平移，对应点横坐标不变，而纵坐标减少2？平移方向平移距离对应点的坐标沿x轴方向向右平移a个单位长度（a>0)向左平移沿y轴方向向上平移向下平移(x+a,y)(x-a,y)(x,y+a)(x,y-a)A1(6,3)B1(3,0)C1(6,-3)D1(9,0)A2(6,9)B2(3,6)C2(6,3)D2(9,6)