Guess I don't know where to look - I found a Triangle Surprise quilt that had a chart on how to make it different sizes. Also found a nifty ruler that can be used to make a triangle the right size to sew to a square, but ... I don't have the nifty ruler. Thanks for looking. Sorry if I just missed it on that site.
I think I over thought myself. The picture of the pattern shows the triangles the same size as the square. I should have known that the tips of the triangle will go past the corners of the square - right?