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画垂线与平行线
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画垂线与平行线. 画垂线与平行线. 垂 足. 两条直线相交成直角时，这两条直线叫做 互相垂直 。. 其中一条直线叫做另一条直线的 垂线 。. 垂线的画法. 过直线上一点画这条直线的垂线. 过直线外一点画这条直线的垂线. 下一步. 过直线上一点. 过直线上一点. 过直线上一点. 过直线上一点. 过直线上一点. 过直线上一点. 过直线上一点. 过直线上一点. 过直线上一点. 返回. 过直线外一点. 过直线外一点. 过直线外一点. 过直线外一点. 过直线外一点. 过直线外一点. 过直线外一点. 过直线外一点. 过直线外一点. 返回.
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画垂线与平行线
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