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2條maths
2011-05-20 7:33 am
回答 (1)
2011-05-20 7:47 am
✔ 最佳答案
1 用正弦公式7/sin(90 - 25) = 5/sin∠CAD∠CAD = 40.3431∠CDA = 180 - 65 - 40.3431 = 79.657D測得A的仰角為10.34312 ∠AOB = 230 - 180 = 50用餘弦公式AB^2 = 46^2 + 20^2 - 2(46)(20)cos50AB = 36.5140 km用正弦公式AB/sin∠AOB = OB/sin∠OAB36.5140/sin50 = 20/sin∠OAB∠OAB = 24.8087因此由A測得B的羅盤方位角為74.8087
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110519000051KK01107