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Tet-trouble
Age 14 to 16
Challenge Level 
Is it possible to have a tetrahedron whose six edges have lengths 10, 20, 30, 40, 50 and 60 units?
Is it possible for a tetrahedron to have edges of lengths 10, 20, 25, 45, 50 and 60 units?
Can you write a set of general rules for someone else to use to check whether a given six lengths could form the edges of a tetrahedron?
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