如图,在平面直角坐标系中,A(1,2),B(3,1),C(-2,-1).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/07b7d24d-efef-4fb8-9f8d-3fb3343f2074.png?resizew=267)
(1)作出△ABC关于y轴对称的△A1B1C1.
(2)△A1B1C1的面积为
(3)在y轴上作出点Q,使△QAB的周长最小.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/07b7d24d-efef-4fb8-9f8d-3fb3343f2074.png?resizew=267)
(1)作出△ABC关于y轴对称的△A1B1C1.
(2)△A1B1C1的面积为
(3)在y轴上作出点Q,使△QAB的周长最小.
更新时间:2020-02-22 18:49:43
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名校
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(1)在图中画出与
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(2)直接写出
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(3)在图中找出点
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【推荐1】在如图所示的直角坐标系中,每个小方格都是边长为1的正方形,△ABC的顶点均在格点上,点A的坐标是(﹣3,﹣1).
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【推荐2】如图所示,在平面直角坐标系中,
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(1)已知点
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