Like this:
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/ \ <-- triangle
/__\
/ /\
/__ /_\ <-- another triangle
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Parallelogram
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right triangle and isosceles triangle
An equilateral triangle and an isosceles triangle would both have lines of symmetry that would split it into two triangles.
By cutting off two of its corners which will leave you with 2 triangles and 1 pentagon.
An isosceles triangle is defined as a triangle that has two sides of the same length. With two identical right triangles, it is possible to arrange them into a bigger triangle that has two sides that are the same length.
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.