What can be made of two identical triangles?
Triangle (any isosceles triangle), square (rectangle), diamond
Of course, other strange graphics can also be used
Two identical obtuse triangles can form a parallelogram. Is that right?
Exactly
As long as it is exactly the same triangle, no matter what triangle, can be put together into a parallelogram
Two identical obtuse triangles form a parallelogram whose area is ()
2 times