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从 Wikibooks，一个开放世界中的开放书籍
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Descriptive Geometry
加/减
乘/除
黄金分割
椭圆/抛物线/双曲线
三角形到直角三角形
具有指定边长的直角三角形
三角形的面积
多边形简化为三角形
类别
:
手册：几何
华夏公益教科书
