这个定律适用于任何直角三角形。
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.
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.
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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