这个定律适用于任何直角三角形。

This law is true of any right triangles.

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将三角形中的余弦定律进行推广，得到一般平面封闭折线的余弦定律。

In this paper, the cosine law of general closed planar broken line is acquired by generalizing cosine law of triangle.

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数学定律：“在三角形中，任意两边和大于第三边”。

"The sum of the two sides of a triangle are greater than the third" is a mathematical truth.

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