更新1:
那麼在ab ≤ 0的時候又該如何計算？
“Shell method” of surface area
2010-06-01 12:08 am
Let y = f(x) be a function continuous on [a,b] and ab ≥ 0. Find the area of the surface obtained by revolving y = f(x) between x = a and x = b about the y-axis.
回答 (1)
2010-06-05 6:20 am
✔ 最佳答案
Isn't it the surface area itself a shell???2010-06-04 22:20:37 補充：
Please see the following by dividing the surface as rings:
圖片參考：http://img218.imageshack.us/img218/8587/88412607.png
2010-06-04 22:20:44 補充：
http://img218.imageshack.us/img218/8587/88412607.png
收錄日期: 2021-04-23 23:22:51
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100531000051KK00795