Geodesic
In and Ex Spheres of a Tetrahedron
Journal for geometry and graphics, Tome 28 (2024) no. 1, pp. 19-27 Cet article a éte moissonné depuis la source Heldermann Verlag

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We prove that
Classification : 51M04
Mots-clés : In-sphere, in-center, in-radius, ex-sphere, ex-center, ex-radius, twin tetrahedron, isosceles tetrahedron, regular tetrahedron, centroid, circumsphere, circumradius, circumcenter, orthocentric tetrahedron, orthocenter, Lagrange multipliers 
@article{JGG_2024_28_1_JGG_2024_28_1_a1,
     author = {H. Katsuura },
     title = {In and {Ex} {Spheres} of a {Tetrahedron}},
     journal = {Journal for geometry and graphics},
     pages = {19--27},
     year = {2024},
     volume = {28},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/JGG_2024_28_1_JGG_2024_28_1_a1/}
}
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H. Katsuura . In and Ex Spheres of a Tetrahedron. Journal for geometry and graphics, Tome 28 (2024) no. 1, pp. 19-27. http://geodesic.mathdoc.fr/item/JGG_2024_28_1_JGG_2024_28_1_a1/