Use an indirect proof to show that the diagonals of an isosceles tzoid cannot bisect each other.?

ume that the diagonals of an isosceles tzoid bisect each other. If they did, the tzoid would have to be a parallelogram and have two sets of parallel sides. But since the definition of an isosceles tzoid is that there is only one set of parallel sides, the diagonals of an isosceles tzoid cannot bisect each other.