| 11. | :If the quadrilateral is convex then the diagonals will cross.
|
| 12. | The irregular quadrilateral within this boundary includes six large blocks covering.
|
| 13. | This means that the only subdivision complexes are tilings by quadrilaterals.
|
| 14. | The painting is of a red quadrilateral on a white field.
|
| 15. | They held their first quadrilateral meeting in Istanbul last month.
|
| 16. | A crossed quadrilateral is sometimes likened to a bow tie or butterfly.
|
| 17. | An orthodiagonal quadrilateral is a quadrilateral whose diagonals are perpendicular.
|
| 18. | An orthodiagonal quadrilateral is a quadrilateral whose diagonals are perpendicular.
|
| 19. | In the latter case the quadrilateral is a tangential quadrilateral.
|
| 20. | In the latter case the quadrilateral is a tangential quadrilateral.
|
