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  "body": "\n## Summary\n\nA tetrahedron is a [[polyhedron|0325SGSJAR]] with four triangular faces, six edges and four vertices.\nIt is the convex hull of four points of space that do not lie in one plane.\nIt is the three-dimensional [[simplex|YX1DJK2QAG]], the simplest solid, and it plays the role in space that the triangle plays in the plane.\n\n## Explanations\n\n### L1 human\n\nA tetrahedron is a pyramid on a triangular base.\nTake four points that do not lie on one flat sheet and join each pair by a straight edge: the solid you get has four triangle faces.\nThe corners $(0, 0, 0)$, $(1, 0, 0)$, $(0, 1, 0)$, $(0, 0, 1)$ give a tetrahedron of volume $1/6$.\nThe regular tetrahedron, with all four faces equilateral, is one of the five Platonic solids.\n",
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