Suppose cluster sampling we’re being used a survey users of a particular social network site 20% of the entire population of the United States use this site based on a table below which city will be considered the best closer to use for this survey

If the angle bisectors of a pair of opposite angles of a quadrilateral are the opposite sides of a parallelogram formed by the two angle bisectors and two sides of the quadrilateral, is the quadrilateral always a parallelogram? explain your answer.