27) What is the quadrilateral if opposite sides are equal and parallel?

28) What is the quadrilateral if all the four sides are equal and the diagonal bisects at right angles?

29) What is the quadrilateral if all the four sides are unequal and one of the angle is 90 Degree?

30) What is the quadrilateral that has its opposite sides are equal and parallel and all the four angles are right angles?

31) What is the polygon if the sides and angles are equal?