There is no combination of trapezoids which can form a triangle.
well not exactly, if you have three " isoceles like trapezoid", then you can, provided, you are allowed to overlap.
you should be able to figure it out now....
What if the triangle was equilateral and the trapezoids were isoceles?
You wouldn't need the trapezoids to overlap.
Use the longer 'bottom' edge of each trapezoid and the 'left' edge of the next trapezoid to make up the edge of the triangle. The shorter 'top' edge of the trapezoids touch the 'right' edge of the next trapezoid in the center of the triangle.
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yes, it makes an isosceles triangle
Let's assume the triangle has points A, B, and C. Method 1 (3 lines) Draw two lines across the triangle parallel to line segment AB. Now you have two trapezoids and one triangle. Draw another line from C to the any point on the closest of the two lines you just drew, splitting the triangle into two more triangles. Method 2 (2 lines) Draw one line across the triangle parallel to line segment AB. Now you have one trapezoid and one triangle. Draw a second line that passes through C and is perpendicular to AB, splitting the trapezoid into two trapezoids and the triangle into 2 triangles. Method 3 (3 lines) Draw one line from point C to any point on line segment AB. Then draw a line parallel to AC and one parallel to BC, but don't let them cross the line you just drew.
No
It seems that if you can make 1, then you can make 3 .
It could be two trapezoids, or a triangle and a quadrilateral. It all depends on where the cut is made.