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ROSECODE 446

Generalized ellipse 2

liuguangxi · Math ·

The definition of n-ellipse is as below: given n points (called foci) in a plane, an n-ellipse is the locus of all points of the plane whose sum of distances to the n foci is a constant. We can generalize the definition from plain to space, and the set of all points satisfying the constraint become a surface.

There is a tetrahedron ABCD of edge length 1 in a space. A 4-ellipse surface is the set of all points of the same space whose sum of distances to the 4 points A, B, C and D is 4 (see the blue solid in the picture).



Find the enclosed volume and surface area of the closed surface above. Give your answer rounded to 6 digits after the decimal point.

Answer format: [volume],[surface area]

Example: 4.188790,12.566371 for a sphere of radius 1.