MATHS_9
2009-05-03 8:09 am
回答 (2)
2009-05-03 8:30 am
✔ 最佳答案
圖片參考：http://i293.photobucket.com/albums/mm67/zaza520/0001-87.jpg
(a)
angle B=60+(180-135)=105
By Cosine Law ,
AC^2=AB^2+BC^2-2(AB)(BC)cos(angle B)
AC^2=4^2+5^2-2(4)(5)cos(105)
AC=7.17km
(b)
By Sine Law ,
BC/sinA=AC/sinB
5/sinA=7.17/sin105
A=42.4
羅盤方位角為S(180-42.4-60)E=S77.6E
2009-05-03 8:13 am
用quadratic計吧
收錄日期: 2021-04-22 00:44:05
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090503000051KK00029