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.
The word polygon is a combination of two Greek words: poly means many and gon means angle. Along with its angles, a polygon also has sides and vertices. Tri means three, so the simplest polygon is called the triangle, because it has three angles.It also has three sides and three vertices.A triangle is always coplanar, which is not true of many of the other polygons.ri means three, so the simplest polygon is called the triangle, because it has three angles. It also has three sides and three vertices. A triangle is always coplanar, which is not true of many of the other polygons.