rectangular pyramid
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Inscribed triangles in a rectangle are identical right triangles but they are rotated 180 relative to each other.
the area of a triangle is half that of a rectangle made using two of those triangles.
Absolutely. Any two congruent right triangles will form a rectangle, and if the right triangles are isosceles right triangles, they will form a square.
Draw a rectangle made with three squares. Then put a diagonal line through the center one. Tah-Dah
It would depend on the triangles, but assuming they were equilateral or isosceles, a trapezoid if alternated in a line.