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Two equilateral triangles.
The answer will depend on the exact shapes of the individual items.
A square is a 2 dimensional shape, but it can be divided into 2 or more triangles, or more smaller squares, or hexagons and triangles, or octagons and triangles, or really any rectilinear figure and triangles. If you mean what two dimensional shapes can compromise the surface of a cube, or rectangular prism, then you want squares. if you mean what 1 dimensional figures can make the perimeter of a square, then you want lines (straight lines).
A pyramid has a triangle for each side of the base, thus for a square pyramid you'll need one square (for the base) and 4 triangles.
You can create several shapes using four triangle cutouts from a rectangle, depending on how you arrange them. For instance, you can form a larger triangle by aligning the triangles at their vertices, or create a square by positioning them in a way that their bases form the sides of the square. Additionally, overlapping the triangles can produce various abstract shapes or patterns. The possibilities are limited only by the arrangement and orientation of the triangles.