A pyramid could be constructed from 4 or more triangles.
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A dodecagon is a 12 sided shape made from 10 triangles
An heptagon which is a 7 sided shape made from 5 triangles
Yes.
It would depend on the triangles, but assuming they were equilateral or isosceles, a trapezoid if alternated in a line.
Triangular prisms and Rectangular pyramids