write if the statement is correct and if not, write F. 11. Every quadrilateral is a parallelogram. 12. Every parallelogram is a quadrilateral. 13. Every rhombus is a rectangle. 14. All trapezoids are isosceles. 15. Every rhombus is equiangular. 16. Diagonals of parallelogram are congruent. 17. The opposite angles of square and rectangle are supplementary. 18. All sides and angles of a rhombus are congruent. 19. A rectangle is a square. 20. A quadrilateral is a parallelogram if the diagonals bisect each other.​