更新1:
兩個已知的內角可能相鄰，可能不相鄰。
數學知識交流---面積難題 (2)
回答 (3)
2011-07-27 8:04 pm
✔ 最佳答案
答案是肯定的.不論已知兩角是否相鄰,亦有方法求得該五邊形之面積.
方法如下:
圖片參考：http://imgcld.yimg.com/8/n/HA00132885/o/701107260052113873433050.jpg
2011-07-27 12:17 am
Answer is yes. Method : Cutting the 5-sided polygon into 3 triangles and then applying cosine rule, sine rule and Heron's formula.
2011-07-26 16:18:54 補充：
Note : If the 2 angles are not adjacent angles, then sine rule is not necessary.
2011-07-26 16:20:09 補充：
Also using formula Area = (ab sinC)/2.
2011-07-26 16:18:54 補充：
Note : If the 2 angles are not adjacent angles, then sine rule is not necessary.
2011-07-26 16:20:09 補充：
Also using formula Area = (ab sinC)/2.
2011-07-26 10:01 pm
兩個已知的內角是否相鄰?
收錄日期: 2021-04-25 22:40:14
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110726000051KK00521