Step-by-step explanation:
yes because after the first rotation the triangle formes a parallelogram, because the interior angles are equal, because the parallelogram is basically formed of two identical triangles. after the second rotation the triangle forms yet another parallelogram(the one "glued" to the initial triangle) for the same reason. in conclusion the bases of the final quadrilateral will always be paralel because of the parallelograms=>it will always be a trapezoid
