数学定义和定理 Flashcards by Elsa Luo

Q

垂线的定义

A

两直线相交，若其中一个角是90度，则两条线互相垂直，交点为垂足

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Q

垂线的性质

A

过直线外一点有且只有一条线与该直线垂直

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Q

点到直线的距离定义

A

过此点到该直线垂线段的距离

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Q

平行线定义

A

在同一平面内，不相交的两条直线叫做平行线

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Q

平行公理及推论

A

过直线外一点，有且只有一条直线与这条直线平行
如果两条直线都与第三条直线平行，那么这两条直线也互相平行

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