必须保持和交通车辆平行，以避免余弦定律产生的错误。
Must be set up absolutely parallel to the traffic flow to avoid "cosine" errors.
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.
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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