They can form into a 4 sided quadrilateral if they are the same size.
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No, two scalene triangles, for example, can never make a rhombus..
the shape that can make two smaller triangles is parallelogram.
The fewest number of triangles that make up a trapezoid are two isosceles triangles.
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Two Isosceles triangles.__ ^/ / / |/ / / |V --