Sewing Triangles In Quilt~PLEASE HELP!!!!!?

I am SO confused as to why I just can't seem to make these triangle points work for me! I don't have a pattern, but I will try to describe the layout. There are 25 blocks, each surrounded by a border. The blocks are as follows: There is a square (3x3 plus 1/4 inch on each side for seam allowance) in the center. Four triangle surround the square (one on each side). This, essentially, forms a larger square. Around the larger square that was just formed, eight more triangles surround it, with two triangles on each edge. Again, this forms a larger square. My problem is this: When I go to sew on the eight outer triangles, the points on the triangles from the previous round end up getting squared off. I'm hoping I described the layout of the block well enough, and I'm sorry I don't have a picture. Any help would be appreciated!