What about the circular arc corner of the bookcase?
Round any two terminals of a diameter of the circle is divided into two arcs, more than half is less than a semicircle arc, semicircle is called minor arc, arc, straight line connecting two points is AB string AB.
The circle between any two points is called arc, arc arc. Referred to as symbol "-".For example, read arcs AB or arcs AB with A and B as endpoints. More than half of the arc is less than half of the arc, the arc is minor. The degree of an arc is the degree to which the arc is centered.
This kind of thing needs to furniture factory fixed processing, want carpentry scene to make difficult. Furniture factory in a variety of equipment, there are many ways to open this arc, usually made of mdf. The arc, relative to the outer circle, inner circle is simple, can please the master painter, right, fill putty (gypsum can), cylindrical extrusion mold arc, drying and grinding sanding paint.
