What size do you need to cut with the rotary cutter?
The rotary cutter means that you dont have to use templates and here are some simple rules that you can apply throughout your patchwork: On the Flying geese fast no-waste method you just need to add 1 1/4" to the finished size you need for the larger square so for 4" you need 5 1/4" and then 7/8 to the size of the smaller square - so again you are right at 2 7/8 and if you want to enjoy the video on this click here: The other magic numbers for rotary cutting are as follows:
For a plain square you add 1/2" so 4" finished becomes 4 1/2" For a half-square triangle we now add 1" - so cut 5", - and once sewn trim back to be an accurate 4 1/2" before sewing
and for quarter-square triangles we add 1 1/4" (as per the flying geese) and pay attention to the seam allowance we sew!