What are the dimensions of the coin worth ₩200?
CREATE TABLE "table1_298883_5" (
  "value" text,
  "dimensions" text,
  "main_color" text,
  "obverse" text,
  "reverse" text,
  "watermark" text,
  "date_of_issue" text
);
SELECT "dimensions" FROM "table1_298883_5" WHERE "value"='₩200';