Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. release your mouse button when the item is place. if you change your mind, drag the item to the trashcan. click the trashcan to clear all your answers. prove: the segments joining the midpoints of the opposite sides of a quadrilateral bisect each other. midpoints of both segments are the same point; therefore, segments bisect each other.