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什么是垂直定义
更新时间： 2020-09-17 00:00:00  

1、两条直线相交成直角时，这两条直线互相垂直，其中一条直线是另一条直线的垂线，这两条直线的交点叫垂足。2、两条直线、两个平面相交，或一条直线与一个平面相交，如果交角成直角，叫做互相垂直。

关键词： 什么 垂直 定义

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