angle between two plance....
2011-04-15 3:53 am
圖片參考：http://imgcld.yimg.com/8/n/HA00510450/o/701104140088113873426280.jpg
1.find the angle between the planes DAF and CBF
2.find the angle between BFand BD
回答 (1)
2011-04-16 8:57 pm
✔ 最佳答案
1. BC=6, DF=sqrt(364), DC=sqrt(300)angle between the planes DAF and CBF
=arccos [ (64+364-300)/2/8/sqrt(364) ] = 65.2
2. BD=50, BF=sqrt(1000), DF=sqrt(1700)
angle between BFand BD
=arccos [ (2500+1000-1700)/2/50/sqrt(1000) ] = 55.3
收錄日期: 2021-04-23 19:48:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110414000051KK00881