If you have 6 equilateral triangles, you can arange them (edge to edge) to make 12 different shapes.
We have found 11 shapes, but can't find the 12th.
I can't show you what I have found as I can't draw on Mn....I guess we need a web-site that shows us the answers.
We have been huffling pieces of paper around for an hour...everything e come up with is the same as something we already have.