さんかくすい
三角錐
1. triangular pyramid
2. TetrahedronIn geometry, a tetrahedron is a polyhedron composed of four triangular faces, three of which meet at each vertex. It has six edges and four vertices. The tetrahedron is the only convex polyhedron that has four faces. The tetrahedron is the three-dimensional case of the more general concept of a Euclidean simplex. The tetrahedron is one kind of pyramid, which is a polyhedron with a flat polygon base and triangular faces connecting the base to a common point.
Read “Tetrahedron” on English Wikipedia
Read “三角錐” on Japanese Wikipedia
Read “Tetrahedron” on DBpedia
Read “Tetrahedron” on English Wikipedia
Read “三角錐” on Japanese Wikipedia
Read “Tetrahedron” on DBpedia
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