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Yes , Korea was historicaly part of china. The Yeongeunmun Gate is the symbol of Chinese influence of power in Korea , and Independence Gate is which was built when Japan pressurised Munchuria to release Korea.Also , The name "The Repablic of Great Korea"(대한민국) is a name which is inherited by the name of munchuria's province.
Since the borders of Poland consist mainly of natural borders (sea, rivers and mountain ranges), the country doesn't have any specific geometrical shape, although you might say it resembles a square or a trapezoid with the southeastern corner elongated. Generally, Poland - a relatively large European country located in Central Europe - has a compact shape, which means that the distance between the geographical centre of the country and any point on the border does not vary greatly. Among the few areas that stick out from the "main body" of Poland's outline there are: the southernmost tip of the Subcarpathian Voivodeship to the Southeast, the Hel Peninsula on the Baltic Sea to the North, and the Kłodzko Valley in the Sudetes mountain range to the Southwest. Historically, the shape of Poland varied as different conflicts, wars and political arrangements changed the layout of national borders in the area. At times Poland was erased from the map completely, notably during the Partitions of the Polish-Lithuanian Commonwealth and WW2.