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.
Introduction: The word polygon derived from the Greek word âpolyâ means âmanyâ and âgonâ means âangleâ. In math polygon is a two dimensional shapes. Polygons can be made by using straight lines segment and the polygon objects are closed by lines. The straight line segment is known as facesor sides. The point at which where the two faces of the polygon meets is known as vertices or corners of the polygon.