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开始
1
垂直线
2
性质
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几何课程/直线/垂直线
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来自维基教科书，开放的书籍，为开放的世界
<
几何课程
|
直线
垂直线
[
编辑
|
编辑源代码
]
如果两条直线相交形成 90
o
的角，则称它们互相垂直
性质
[
编辑
|
编辑源代码
]
类别
:
书籍：几何课程
华夏公益教科书
