I had to think, because its been about 5 or 6 yrs since i've completed this quilt. On the picture below, I drew the black lines to show the pieces sewn together to form the border. While this quilt has the diamonds arranged a bit different than in your quilt, they're the same.
They way that I figured the trapezoid pieces was that I played w/ the diamond shapes, laying them on top of one another to get the right size. Then I cut them out of the finish fabric.
I did the same thing playing w/ the diamond shapes to figure out the pattern piece for the pentagon shape pieces on the side.
Took a bit of work, thinking, and trial and error, but once i got it, I absolutely loved it.
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Last edited by 117becca; 01-05-2017 at 02:56 AM.