# Insphere and Four Exspheres of a Tetrahedron

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A tetrahedron has four vertices and four triangular faces. There are five spheres tangent to all four planes containing the faces.

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Contributed by: George Beck (December 2015)

Open content licensed under CC BY-NC-SA

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"Insphere and Four Exspheres of a Tetrahedron"

http://demonstrations.wolfram.com/InsphereAndFourExspheresOfATetrahedron/

Wolfram Demonstrations Project

Published: December 2 2015