the shape that can make two smaller triangles is parallelogram.
You could make a parallelogram.
Two isosceles right triangles, if joined hypotenuse-to-hypotenuse will make a square. Two squares, sided by side, make a rectangle which is a parallelogram, and not a square.
You need at least four triangles, or at least three trapeziums. Or two triangles and one trapezium.
Look at it the other way. Draw a hexagon, and draw two horizontal lines, in each case from one vertex to another one. That way you'll see how to divide the hexagon into a rectangle (not necessarily a square), and two triangles - which, of course, you can combine again to form the hexagon.
yes
the shape that can make two smaller triangles is parallelogram.
two squares and two triangles
Two triangles can but its an irregular shape
You could make a parallelogram.
A triangle and parallelogram
Two squares Two triangles
Two isosceles right triangles, if joined hypotenuse-to-hypotenuse will make a square. Two squares, sided by side, make a rectangle which is a parallelogram, and not a square.
If they are congruent right angle triangles then just join them together side by side to form a parallelogram.
That's like asking "What makes a Chevy a Ford ?". A Hexagon has six sides. None of them have to be equal or parallel. A parallelogram has four sides. Two of them are equal and parallel, and the other two are also equal and parallel. To take a hexagon and make it a parallelogram, you have to do some serious cutting and welding.
You need at least four triangles, or at least three trapeziums. Or two triangles and one trapezium.
two congruent triangles