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,
Any 2 congruent triangles joined together will form a 4 sided quadrilateral
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They make four triangles, not a triangle.
There are 180 degrees in a triangle and 360 degrees in a quadrilateral and its diagonal cuts the quadrilateral into two triangles.
No, they do not.
Join the 6 triangles like pizza slices
All triangles have 3 interior angles that add up to 180 degrees and the 4 interior angles of a quadrilateral add up to 360 degrees but if 2 of its vertices are joined by a diagonal this marks out 2 interior triangles each having 3 interior angles adding to 180 degrees.
Join them together
you might get a kite if the triangles are the same then you might get a rectangle
Three I think but I'm not 100% sure. :-)
If they are congruent right angle triangles then just join them together side by side to form a parallelogram.
You make a dimondxoxoxoxoxoxoxoxo