摘要
Ancientpeoplesfromaroundtheworldknewaboutthespecialrelationshipbetweenacircle'scircumferenceanditsdiameter.π,thenumberrepresentingtheresultwhenacircle'scircumferenceisdividedbyitsdiameter,hadbeenknownandusedonproblemsforthousandsofyears.Consequently,inordertocalculatetheareaofacircle,πisalsoused,area=πr2.
出版日期
2006年12月22日（中国Betway体育网页登陆平台首次上网日期，不代表论文的发表时间）
