| The area of the interior quadrilateral is ½ the area of the original. |
| Notice that the segments of the interior quadrilateral “cut” the corners of the original quadrilateral into triangles. If you can “fold” the triangles over their common edges, then the triangles will join to form the interior quadrilateral. This suggests that the area of the interior quadrilateral is ½ the area of the original. See Quadrilateral picture |