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急!F5 Solving Triangles 10exq1

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請詳細步驟教我計以下一條 : 圖片參考:http://imgcld.yimg.com/8/n/HA05788109/o/20130416232036.jpg

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3. (a) In ΔABC : cosA = (AB2 + AC2 - BC2) / (2 x AB x AC) (cosine law) cosA = (652 + 452 - 302) / (2 x 65 x 45) A = 23.9° cosC = (AC2 + BC2 - AB2) / (2 x AC x BC) (cosine law) cosC = (452 + 302 - 652) / (2 x 45 x 30) C = 118.8° The true bearing of B from A = (118.8° + 130° - 180°) + 23.9° = 092.7° (b) Draw the altitude CH of ΔABC. In ΔACH : sinA = CH/AC sin23.9° = CH/(45 km) CH = 18.2 km The shortest distance of the ship to island C = 18.2 km

其他解答:A215E4A2B88AAE64
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