美国国旗的变化无论从历史方面、社会方面还是数学方面都极为有趣。这里说的就是与美国国旗有关的数学问题。1818年4月4日美国国会议案规定,美国每多一个州,就在其国旗上增加一个五角星。这次设计出的国旗为长方形,蓝底色,20个白 The change of the American flag is extremely interesting both in history and in society as well as in mathematics. What we’re talking about here is the math problems related to the American flag. On April 4, 1818, the U.S. Congress passed the law that every five states in the United States will add a five-pointed star to its flag. The design of the national flag for the rectangle, blue, 20 white