Jisho

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三角形中心
Wikipedia definition
1. Triangle centerIn geometry a triangle center (or triangle centre) is a point in the plane that is in some sense a center of a triangle akin to the centers of squares and circles. For example the centroid, circumcenter, incenter and orthocenter were familiar to the ancient Greeks, and can be obtained by simple constructions. Each of them has the property that it is invariant under similarity.
Read “Triangle center” on English Wikipedia
Read “三角形の中心” on Japanese Wikipedia
Read “Triangle center” on DBpedia

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