http://www.homebuildingandrepairs.com... Click on this link to learn more about arches, house framing and building repairs. Here's a question you might be asking yourself, how in the heck do they figure out how to create a variety of different circular arch shapes. It's done by moving circles around and by changing the size of the circles themselves. Don't forget to visit the website for more tips and ideas for your next remodeling or building project.