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词汇	reentrant angle
释义	reentrant angle 也作 re-entrant anglen.Mathematics（名词）【数学】angle CBA is a reentrant angleClarinda/Academy Artworks In an irregular polygon, an interior angle that is greater than 180° and whose apex faces into the polygon.凹角：在不规则多边形中超过180度，而且其顶点指向多边形内部的内角
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