II. Write True if the statement is correct and if not, write False.
________6. Every parallelogram is a quadrilateral.
________7. Every rhombus is equiangular (equal angles).
________8. Diagonals of parallelogram are congruent.
________9. The opposite angles of square and rectangles are supplementary.
________10. A rectangle is a square.
________11. A quadrilateral is a parallelogram if and only if the diagonals bisect each other.
________12. Every rhombus is a square.
________13. The diagonals of a parallelogram forms two congruent triangles and the total measures
of the interior angles is 360֯
________14. All quadrilaterals are parallelogram.
________15. A square is a rectangle.