The drawing should indicate the radius of the arc, or the length (chord) of the two ends of the arc, and the distance (height) from the arc vertex to the chord. You can use these data to make a template out of wood boards. Generally, the radius of the arcs that appear in interior decoration is not very large. You can use wooden strips to draw the arcs directly on the woodworking board at the construction site. I just saw your picture. It is not difficult to make this shape. It should be said that as a woodworker, it can be solved. As long as you know the outer or inner diameter of the shape and the thickness of the edge, you can follow the method of drawing a circle and draw two concentric circles with the same point as the center, and use half of the circle; the distance between the circles is The distance is the thickness of the edge of the shape. Of course, the thickness of the plywood covering the outside must be deducted first.