Orthocentric system
- 垂心组（在几何学中，一个垂心组是由四个点组成的平面图形，使得其中一点都是另外三点组成的三角形的垂心）
Orthocentric system
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abstract:
In geometry, an orthocentric system is a set of four points on a plane, where one of which is the orthocenter of the triangle formed by the other three.
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WordNet