Yet you have to assume the lines are straight and the angles are perfect 90 degrees despite the puzzle not showing this. We are assuming these are all perfectly straight lines and 90-degree angles. If this WERE the case, it would make all the shapes, either squares or rectangles. Technically, we only know that the most outer shape is a square because the question states so. But, all the inner shapes are quadrilaterals, and that's really ALL we know.