《画轴对称图形(2)》PPT课件
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一是利用“垂线法”; 二是在有网格的坐标系中直接数格点.
知识回顾 问题探究 课堂小结
探究二 活动1 关于坐标轴的对称点
(1)根据探究一的作图,填写表格.
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画轴对称图形
第二课时wk.baidu.com
2020年10月5日
1
知识回顾 问题探究 课堂小结 随堂检测
画一个图形的轴对称图形的一般步骤:
①过已知点作已知直线的垂线,并确定垂足;
②在直线的另一侧,以垂足为一端点,在垂线上作一条线段使之等
于已知点和垂足之间的线段的长,得到线段的另一端点,即为对称
点;
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③连接通过原图形已知点所作的这些对称点,就得到原图形的轴对
称图形.
这个方法可以称为作轴对称图形的“垂线法”.
知识回顾 问题探究 课堂小结 随堂检测 探究一: 在直角坐标系中画点关于坐标轴的对称点 活动1 在直角坐标系中画出下列已知点:A(2,-3);B(-1,2);C(-6,
-5);D(3,5);E(4,0);F(0,-3).
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E(4,0)
F(0,-3) A(2, -3)
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D(3,5)
B(
-
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C( - 6,- 5)
坐标系中描点,应通过对应的横纵坐标轴上的数据作坐标轴的垂线,两 垂线的交点即为该点.
知识回顾 问题探究 课堂小结 随堂检测 探究一 :在直角坐标系中画点关于坐标轴的对称点 活动2 画出以上点分别关于x轴和y轴的对称点.
怎么作出已知点关于x轴和y轴的对称点呢?
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