# Functions
弧度转角度.
平面直角坐标系，计算角度.
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变成0-359.
角度转弧度.
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获取2个角度的差值（返回锐角角度），0-180.
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点p是否在矩形中.
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点到线段的距离 https://stackoverflow.com/a/6853926.
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Angrad 为弧度.