Solid of revolution 2

圖片參考：http://i1099.photobucket.com/albums/g395/jasoncube/457e6ec1.png


I HOPE THIS CAN HELP YOU! ~ ^_^

2012-08-19 22:17:56 補充：
= ½πln(2 + √3)

2012-08-19 22:36:53 補充：
They are the same actually, try to prove it by yourself first? :)

2012-08-20 10:30:23 補充：
Next time when you meet the same situation, check the two ans by calculate first

2012-09-04 12:44:23 補充：
***by calculator

***by calculator