We draw an arc with a circul. Drink an arc. The same way also acts with the second piece of chipboard. It is better to use an electrician for cutting. We prepare the frame. The thickness of the arch should not exceed the thickness of the wall on which it is installed. Moreover, the bars are included in the thickness of the arch, which make up the frame, as well as two pieces of chipboard. Cut the bars, you need to drill holes in the wall, score plugs there, and then fasten the frame using screws.
