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Truncated Tetrahedron
Age 11 to 14
ShortChallenge Level 
A regular tetrahedron with edges of length 6 cm has each corner cut off to produce the solid shown.
The triangular faces are all equilateral triangles, but not necessarily the same size.
What is the total length of the edges of the resulting solid?
This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.
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