The only thing I can come up with would be a tetrahedron. You could make a pyramid with a square (open) base, I guess.
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Triangles are congruent to each other if they have the same 3 sides in length and have the same interior angles.
A triangular prism would fit the given description
Isosceles triangle
no it makes a square.
If they are congruent right angle triangles then just join them together side by side to form a parallelogram.