CREATE TABLE table_31380 ("Value" TEXT, "Dimensions" TEXT, "Main Color" TEXT, "Obverse" TEXT, "Reverse" TEXT, "Watermark" TEXT, "Date of issue" TEXT)

What are the dimensions of the coin worth 200?
SELECT "Dimensions" FROM table_31380 WHERE "Value" = '₩200'
SELECT "Dimensions" FROM "table_31380" WHERE "Value" = '₩200'