The book was likely finished sometime in late 1987 or early 1988]. II.The collapse of Communism in the Balkans. It is likely that Gorbachevâs ideas for liberalizing East European communist states worked out best in the Balkan states of Bulgaria and Romania.
A polygon is a  closed plane figure made of three or more straight line segments. The term originated from ancient Greek polygonon, which breaks down to polus (many) and gonia (angle). A polygon is a closed plane figure made of three or more straight line segments.
A polygon is a plane figure that is bounded by a closed path or circuit, composed of a finite sequence of straight line segments. Area of Polygon = ((side)Â² * N) / (4Tan(Ï / N)) Perimeter of Polygon = N * (side).Area of Polygon = Â½ * RÂ² * Sin(2Ï / N).Area of Polygon = AÂ² * N * Tan(Ï / N). A = R * Cos(Ï / N). = side / (2 * Tan(Ï / N)) where, N = Number of sides, A = Apothem, R = Radius, P = Perimeter. Polygon Formula : Using length of a side : Using radius (circumradius) : Using apothem (inradius) : where. Using apothem and length of a side : where.