This proof divides one right triangle into two others and uses the principle that if the corresponding angles of two triangles are the same, the ratio of their sides is the same, too.
这种证明将一个直角三角形分为两个部分，利用了如下定理：如果两个三角形对应的角相同，那么它们的边的比例也是相同的。
Corresponding angle
原声例句
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Transversal (geometry)
（重定向自Corresponding 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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