Volume

2013-12-27 4:36 am
ABCD is a tetrahedron with AB = 5 cm., AC = 8 cm. and AD = 4 cm.
Angle BAC = 60 degree. Angle DAC = 45 degree. What is the volume of ABCD?

回答 (3)

2013-12-29 6:56 pm
✔ 最佳答案
Please see the working via this link:
http://postimg.org/image/up08kxhkd

2013-12-29 11:04:59 補充:
Just forgot to divide the result by 3,
the final answer should be
10/3 * sqrt[15 + 4*sqrt(2)]
參考: lushmeadow.joinbbs.net
2013-12-27 6:38 am
郭老師~
有道理~!!

多謝提點!

^___^

2013-12-26 22:41:05 補充:
咦?
咁應該無答案?

因為 fix 實 △ABC 在地上之後,△DAC 可以摺高摺低,volume會變~

2013-12-26 23:39:25 補充:
似乎應該題目有誤~

而家的setting應該無特定的答案~

2013-12-27 08:30:07 補充:
郭老師~

發問者已經補充了資料~

我沒有時間答他了~

我先刪掉剛才的答案,看看誰人幫他解答吧。
2013-12-27 6:34 am
Sorry. I just want to know
Why angle DAO = 45⁰

2013-12-26 23:10:32 補充:
我都試過想做這條,但劃左個圖想了一會便發覺唔識做,所以見了你的答案才會多口一問。

2013-12-27 13:18:18 補充:
Sorry. 我仍然計唔到條高。


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