Lay your ruler along the side even with the paper and trim.
Here's one that's been trimmed on all three sides:
You can remove the paper foundations after trimming the geese, but I prefer to leave mine on until the side triangles are added. It gives more stability to all those strings which are now cut on the bias. The papers are a little tougher to remove after adding the sides, but it's worth it to me to have the stability of the paper when sewing.
I used my Easy Angle ruler to cut the side triangles, but if you don't have one you can cut 4-7/8" squares and cut them on one diagonal to get two right triangles. With the Easy Angle, I cut several 4.5" strips, stacked them, and used the ruler to cut my triangles.
|First, remove the selvege edge!|
Sew a triangle to one side and press away from the string center.
Now add the other triangle:
This is what they will look like once they are sewn together: