Originally Posted by maviskw

The points are meant to be lost in this pattern. But I have an easier way to cut those lines in the top square:
When you have the lines drawn from corner to corner, partially cut those lines. Make a cut through the center with your ruler and rotary cutter on one of the lines. Then cut the other line, but not through the center. Make a small cut on each side of the cut line. This keeps that piece from getting too floppy when you want to put it together.
Now lay that square RST with the other square and sew around it. When it is time to cut, the lines are already started, so are easy to finish correctly.

When the squares get bigger, you can make the cuts longer, but all that is really necessary is a hole for the scissor tips to get into.