In the paper, we study gravitational field generated by a special type of homogeneous material curves that are denoted circumscribed curves. Characteristic state of these curves is the linking of each one of them to a circle, and the circumscribing of him around the circle, or an arc of him, according to a precise meaning. The circumscribed curve consists of arcs of a circle, and straight segments, their right supports are tangents to the circle. In special case, where this curve is a polygon, the sides are tangents to a circle. In this case, we call the polygon, circumscribed polygon. The study shows that the center of the circle, around it, a homogeneous material curve circumscribed, is an equilibrium center.