it is two 2
If they're shaped appropriately, then it only takes two triangles to make a trapezoid.
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1 rhombus 4-5 triangles
14
6
Two of them because there are 360 degrees in a trapezoid and 180 degrees in a triangle and so it follows that 360/180 = 2
A minimum of 2 triangles are needed, but you can also make a rectangle with 3 or more triangles.