It comes from alternate interior angles.
几何视频中我证明过。
Alternate angle
原声例句
可汗学院：物理
可汗学院：物理
And that's from our-- you know, we know about parallel lines and alternate interior angles.
那是我们的——你知道，我们知道平行线和交替的内角。
英语百科
Transversal (geometry)
（重定向自Alternate angle）
In geometry, a transversal is a line that passes through two lines in the same plane at two distinct points. Transversals play a role in establishing whether two other lines in the Euclidean plane are parallel. The intersections of a transversal with two lines create various types of pairs of angles: consecutive interior angles, corresponding angles, and alternate angles. By Euclid's parallel postulate, if the two lines are parallel, consecutive interior angles are supplementary, corresponding angles are equal, and alternate angles are equal.
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