交点是指线与线、线与相交。在几何学上(准确地说在欧几里德空间中),两条直线如非平行,必存在交点[1]。引申下去,一切事物相交接的时间空间乃至对应的集合交集之元素[2],都可被称为交点

一条直线穿过一个圆形

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