together.  Finger press. 2.     turn over so wrong side of fabric is facing up. On your centre fold line, place a small mark with a removable pen (wash out, iron out, air out, etc).  Then, since we need to make the top edge of the rectangle 6 1/2" long, measure out from this centre mark 3 1/4" and make another mark.  Repeat for other side of centre fold line. 3.     lay your ruler from the bottom corner to this mark on the top edge and cut the corner section off. Repeat for the other side Voila! a trapezoid! Construction 1.     Lay all your pieces out in the proper orientation. 2.     The top and bottom brown trapezoids will be sewn on first.  The most important thing to remember when sewing 'Y' seams is not to sew to the edge of the fabric . So we can get our three seams to meet, pivot and, therefore, lie flat, you must start and stop sewing each seam at the seam allowance distance, in our case 1/4", in from each edge.  Therefore, unlike in most patchwork sewing you must secure the first and last stitch in each seam otherwise it will 'un sew' itself - ugh!!! On the reverse side of each brown trapeziod (do the white ones as well), along the 6 1/2" edge, mark the point 1/4" on each side.  If this proves a little tricky because of the angled side, alternatively mark this point on the reverse side of the 6