Tetrahedron volume calculator
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The area of a lateral surface of the tetrahedron will be equal to three areas of triangles, and the area of the surface of the tetrahedron will be equal to four. To find them, it is enough to know only the side of the triangle.
The ideal volume and surface are calculated for a regular tetrahedron with a side length equal to the average of the 6 distances between the 4 points. The "Robert/Roux" Parameter In their paper on tetrahedron shape, Robert and Roux (1993) present 17 different parameters, as ratios of various volumes, sizes, areas.