幾何學中,歪斜線異面直線是指兩條不共面直線。在立體幾何中,兩條不平行且不相交的直線即為歪斜線。例如一個四面體的兩條對邊互相歪斜

平面幾何中,兩條直線必定共面,故歪斜線只存在於三維及以上的空間中。

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