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Materials you will need:
- Fabric (at least two different colors or prints)
- Rotary cutter or fabric scissors
- Sewing machine
- Iron and ironing board
Cut two squares of fabric to the same size. The size will depend on the finished size of your quilt block, but for example, you could cut 5-inch squares for a 4-inch finished block.
Place the two squares right sides together, making sure the edges are aligned.
Use a ruler and pencil or fabric marker to draw a diagonal line from one corner to the opposite corner of the square.
Sew a ¼-inch seam on both sides of the marked line.
Cut along the marked line to separate the two triangles.
Press the seams open on each triangle.
Trim the dog ears (the small triangles of fabric that stick out beyond the seam) from each triangle.
Place the two triangles right sides together, making sure the seams match up.
Sew a ¼-inch seam along one side of the triangles.
Open the block and press the seam open.
Trim the block to the desired size.
Repeat these steps to create as many half-square triangle blocks as you need for your quilt.
With these steps, you should be able to sew half-square triangle blocks for your quilt project.
This is a great technique for making half square triangles that eliminates the need to directly manipulate the stretchy bias of the triangle. It utilizes two easy to cut squares producing two half square triangles.
On the back of the lighter fabric, draw a pencil line, diagonally from corner to corner.
Stack a pair of light and dark squares, right sides together. Sew a 1/4 inch seam allowance on each side of the line.
You will end up with something like this.
Now cut along the diagonal line.
Press the seam together to set the seam. Then press towards the darkest fabric.
To trim the block to the exact size line up the diagonal 45°angle with the ruler on your seam.
And then carefully trim your block with a rotary cutter.
On the back of the lightest square draw a pencil line 90° to the existing seam on the diagonal:
Butt the central seems:
Sew a 1/4 inch seam allowance on the right and left side of the diagonal line.
Then cut the seam on the pencil line.