First - I tried to resize my pics so we will see how that works!! This is my tutorial for A2 since I didn't like the way thatquilt.com set it up. First you should make 4 half-square triangles [HST]. The finished HSTs in the center of the block are 1 1/16" So I added 7/8" and just went ahead and cut two 2" squares of light and dark fabrics, marked the diagonal and sewed 1/4" on either side. Then I pressed seams open and cut them down to measure just over 1 1/2". Following the photo of the original square I made a four patch.
Step two: I cut a 2 3/8" square of my print and cut it diagonally twice making four triangles
out of my background I cut 4 strips 3" x 1 1/8"
I pinched the center of my background strip at 1 1/2" and lined that up with the point of the triangle and sewed a 1/4" on the opposite side. Once I pressed the resulting triangle, I trimmed the light background to 3/4" from the seam [since the strip should finish a 'generous' 1/2"] I lined up that same 'pinched middle' with the seams joining my HSTs and attached the stripped triangles to the four patch center using a 1/4"seam.
Once all four sides were on I checked to make sure the piece measured 3 1/2" which you can see in the photo.
Step three: I cut a 2 3/4" square of my print and cut it diagonally twice to make the four outermost triangles.
out of background I cut 1 1/4" strips --I SUGGEST CUTTING THEM 1 1/2" so that you are sure to have the full 5" unfinished block as I was a few threads shy
this will keep you from being frustrated later!!
You must make 45-degree cuts at one end of each piece of strip so that they can butt up against the triangle. The shorter side [bottom - facing the center of square] should be 1 1/2" each for the first side you sew the strip against. In 'log cabin fashion' the next two sides you will be attaching will only have one piece that measures 1 1/2" on the short side, the other should measure at least 2 1/2". The final strip should have both ends measure 2 1/2" ....please note that the 'long side' will be roughly an inch longer because of the diagonal cut.
You need to be aware of matching the points of all triangles... I had to do a little reverse sewing, but all in all I think this is much easier than the instruction given at the website. Hopefully the photos will make it easier to understand!! Unfortunately I was able to make notations above or below separate pictures at the old site but havent figured it out here yet.
Have fun!!