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The tetrahedron has 4 equilateral triangles as its faces.
a larger equilateral triangle
It would depend on the triangles, but assuming they were equilateral or isosceles, a trapezoid if alternated in a line.
a square based pyramid.
A four faced figure is a tetrahedron. If they are all congruent triangles, they are all equilateral triangles and it is a regular tetrahedron - one of the 5 Platonic Solids.