|It is a square that is made up of two right-triangles.|
Step 1: Cut two squares of fabric the same size. Mine are 5" square because the next block we are making is a Shoo-fly block and that is the size we will need.
|Step 2: Draw a line (I used a pencil) from one corner to the opposite corner on the lightest colored square.|
|Step 3: Stack the two squares, right sides together. I usually pin them together so they don't shift while I am sewing.|
|Step 4: Sew 1/4" on either side of the drawn line.|
|Step 5: Cut along the drawn line.|
|Step 6: Press open (usually press towards the darker fabric) and you will have two half-square triangles.|
Step 1: Cut two squares of the same size. These are 7" square because the Shoo-fly block we are making next needs four 4 1/2" half-square triangles.
|Step 2: Pin in a few places (I used 4 pins) to keep the blocks from shifting while you are sewing. Sew 1/4" from the edge of the block all the way around.|
|Step 3: Cut through the center of the block from corner to corner.|
|This is what the block looks like after the first cut. |
Don't separate your triangles like I did for the photo!
I just wanted you to see where the cut was.
Keep the two halves together and rotate your ruler to cut the second diagonal.
|Step 4: Cut the other diagonal. Again, I pulled them apart so you could see the second cut.|
|Step 6: Trim your block to 4 1/2" making sure that the diagonal line of your block lines up with the diagonal line on your ruler.|
|(4) Half-square triangles ready to sew into your Shoo-fly block!|
|Printable directions! Click on the image to view full size and print from your browser window.|