It seems that the proof of Pythagoras's theorem comes pretty much from just consulting the ideas of Euclidean triangle, the exhume of Euclidean geometry and simply doing inferences from those.
看起来毕达哥拉斯的定理，似乎来自于欧几里德的三角形理论，从欧几里德几何学的发现中可以简单地推理出来。
Using only elementary geometry, determine angle x. Provide a step-by-step proof.
利用初等几何 求角 x. 写出求解过程.
This article given another kind of proof using algebra method by system of homogeneous linear equations to the geometry question.
本文对这一几何问题利用齐次线性方程组给予了代数方法的又一种证明。
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