In the figure, PQRS is a quadrilateral. PQ = 9 cm, QS = 14 cm,
angle QPS = 106, angle SQR = 55 and QS bisects angle PSR.
( a ) Find angle angle PSQ.
( b ) Find SR.
Figure: http://img705.imageshack.us/i/68802756.jpg/
F4 Maths sine formula don know
2010-03-02 5:58 am
回答 (1)
2010-03-02 6:45 am
✔ 最佳答案
圖片參考：http://imgcld.yimg.com/8/n/HA04628698/o/701003010179313873414900.jpg
a) sinㄥPSQ / 9 = (sin106) / 14
sinㄥPSQ = (9sin106) / 14
ㄥPSQ = 38.16687434°
b)By a)ㄥPSQ = 38.16687434 = ㄥQSR ,
ㄥQRS = 180 - 55 - 38.16687434 = 86.83312566°
14 / sin86.83312566 = SR / sin55
SR = 14 * (sin55) / sin86.83312566
SR = 11.48567cm
收錄日期: 2021-04-21 22:09:44
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100301000051KK01793