they both have straight edges
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triangles and straight lines you can get on decomposing a rectangle.
it is a rectangular pyramid thing so it would have the rectangle as a base and the triangles on each side of the rectangle conected together
Inscribed triangles in a rectangle are identical right triangles but they are rotated 180 relative to each other.
Two of them
If the 2 triangles are right triangles, which are congruent to slicing the rectangle on the diagonal, then arrange one on top of the rectangle, and the other to the side, so that the two hypotenuses are in line with each other. This will make a bigger right triangle, which is similar to the smaller right triangles - each side is double of the smaller triangles.