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They make four triangles, not a triangle.
No, they do not.
Join them together
Inscribed triangles in a rectangle are identical right triangles but they are rotated 180 relative to each other.
An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. They can have faces which are triangles, quadrilaterals, pentagons, hexagons or heptagons,