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it is two 2If they're shaped appropriately, then it only takes two triangles to make a trapezoid.
1 rhombus 4-5 triangles
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
120 triangles.
There are 8 triangles inside a 10 sided decagon