A skin layer of a sports ball is made of plurality of polygon pieces (10, 20) forming spherical shape, a hole (8) for insertion of an air valve is provided in the skin layer, wherein each edge of each polygon piece (10, 20) is a convex arcual edge.

You can measure the area of a polygonal room by taking it apart into triangles and rectangles.

To determine surface, it is necessary to break up this polygonal part into triangles whose surface is calculable.

The inventive clamping device is characterized in that the clamping head segments (10, 12) can be clamped by different degrees so that a polygonal and for example tetragonal work piece is firmly retained from all sides.

The mounting part (12) is formed in a polygonal plate shape.

A skin layer of a sports ball is made of plurality of polygon pieces (10, 20) forming spherical shape, a hole (8) for insertion of an air valve is provided in the skin layer, wherein each edge of each polygon piece (10, 20) is a convex arcual edge.

The socket also defines one of a polygonally shaped opening and a polygonally shaped tang that is received by a work piece of an vehicle idler pulley.

Polygon manufacturing tool which can cut rapidly and economically a work to have a regular polygonal section.

In known electromagnetically actuated valves the valve needle consists, among other things, of a polygon forming link which is connected to the armature.

double head and fifteen degrees offset box wrench

double head and fifteen degrees offset ring wrench

The cross section of the central bore and the insert may similarly define any polygonal or other shape having corners.

double end and flat flare nut wrench

You can measure the area of a polygonal room by taking it apart into triangles and rectangles.

The problem occurs in another form with the additional hypothesis that the room is a polygon.