Perfect arch This is the arch that is exactly twice as wide as its height. It is called perfect because of its perfect symmetry. Window treatments are relatively easy to apply.
Imperfect arch If the imperfection is slight and is off within up to 2 inches, some, but not all, arch window treatments can be made to fit the imperfect arch.
Palladian The Palladian window consists of a large center window that is topped by an arch flanked by two smaller side windows.
Arch Top Windows These windows are rectangular windows on the bottom and arched on the top. They are called extended arch windows because they are arch windows with an extension.
Elliptical Window These are the arches that are wider than twice the height of the window.
Eyebrow Window This arch is like the elliptical arch but it has straight sides making the window taller.