Nets of three-dimensional solids
Possible nets for a tetrahedron
There are only 2 possible nets for a tetrahedron. These are shown below.
Note: There are 4 triangles which are all the same (4 congruent equilateral triangles). When the net is folded into a tetrahedron at each vertex there are three edges/faces meeting. These are the only two configurations of 4 such triangles that form a net for the tetrahedron.
Try some others to convince yourself that this is true.
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