檢視象限角的原始碼

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中文名；象限角

外文名；Quadrant

别名；象限

用于；直角坐标系
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在测量工作中，有时用直线与基本方向线相交的锐角来表示直线的方向。以基本方向北端或南端起算，[[顺时针]]或逆时针方向量至直线的[[水平角]]，称为'''象限角'''，用R表示。象限角不但要表示角度大小，而且还要注明该直线所在的象限。<ref>[https://wenda.so.com/q/1372609130060040 什么叫做象限角 ],360问答 , 2013年6月30日</ref>

从坐标纵轴的北端或南端顺时针或逆时针起算至直线的锐角称为[[坐标]]象限角。其角值变化从0°~90°，为了表示直线的方向，应分别注明北偏东、北偏西或南偏东、南偏西。如北东85°，南西47°等。显然，如果知道了直线的[[方位角]]，就可以换算出它的象限角，反之，知道了象限也就可以推算出方位角。