A short investigation to find the number of ways the net of a tetrahedron can be coloured using four different colours only once. The unit is split into three sections: 1. How many ways can the net of a tetrahedron be coloured using four different colours only once? 2. How many ways can the net of a tetrahedron be coloured if rotations aren’t allowed? 3. How many ways can a 3D tetrahedron be coloured using four different colours only once?