Translation

• area (of a floor, piece of land etc)
• surface area
• tract of land

Examples

• 工厂的面积是1000平方米。
  The area of the factory is 1,000 square meters.
• 日本是由四个大岛和三千多个小岛组成的，面积和加州差不多。
  Japan consists of four major islands and over 3,000 small islands, and is about equal to California in area.