学习过大学物理和高等数学的同学会发现，这个等式会在很多地方出现，不只是在直角三角形中。
Those of us who stuck it out into college physics and higher math learned that this equation shows up a lot more than in just right triangles.
我亲眼目睹有人发布有关微积分和三角法的恒等式难题，并迅速得到别人的解答。
I've seen people post Calculus and Trigonometry equations and get them solved fairly quickly!
例如，R 2 的平方、二维向量的长度、三角不等式等都存在勾股定理。
For instance, it's also the square of the Euclidean norm on R2, the length of a two-dimensional vector, a part of the triangle inequality, and quite a bit more.
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