the shape that can make two smaller triangles is parallelogram.
You can combine the 2 triangles for a square and then add the 2 other squares next to it, and you get a rectangle. :) And you're welcome
The answer depends on the shapes and sizes of the triangles. I can make a big triangle, a quadrilateral, pentagon, hexagon, etc up to 12 sides.
5 or 6 Depending on what shape you are thinking of
All of them.
The two triangles would make either a square or a rectangle.
You could make a parallelogram.