angle of elevation &depression
2012-07-27 9:00 am
圖片參考：http://imgcld.yimg.com/8/n/HA00437808/o/701207270003413873413100.jpg
plz step by step
thanks a lot!
回答 (1)
2012-07-27 9:42 am
✔ 最佳答案
The answer is : B. 5 sin50° / sin60° m∠RPS = 20° + 40° = 60°
∠PSR = ∠SPQ = 90° - 40° = 50°
By sine law :
PR/sin∠PSR = RS/sin∠RPS
PR/sin50° = (5 m)/sin60°
PR = 5 sin50° / sin60° m
參考: micatkie
收錄日期: 2021-04-13 18:51:54
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