还有一道数学: The perimeter of square S is 40. Square T is inscribed in square S. What is the least possible area of square T?这题找到答案了,我不明白的是为什么会有least possible area,原来The way T can be inscribed is one these two extremes: It is precisely the same square or it is a diamond in the square.(http://answers.yahoo.com/question/index?qid=20120805211313AAMbzHb)