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.
(Note: most all of the polygons on the SAT that are made up of five sides or more will be regular polygons, but always double-check this! You will be told in the question whether the shape is regular or irregular.) The different types of polygons are named after their number of sides and angles. A triangle is made of three sides and three angles (âtriâ meaning three), a quadrilateral is made of four sides (âquadâ meaning four), a pentagon is made of five sides (âpentaâ meaning five), and so on.