Monday, August 6, 2012

Four Spheres in a Tetrahedron

Four spheres of unit radius are contained in a regular tetrahedron in such a way that each is tangent to three faces of the tetrahedron and to the other three spheres. What is the side length of the tetrahedron?
This problem is from the book ``Beautiful Mathematics," published by the Mathematical Association of America.


My math page: https://sites.google.com/site/martinerickson/

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