英语 的 数学题 求助。。

来源：百度知道 编辑：UC知道 时间：2024/05/17 15:25:41
Three deer, A, B, and C, are grazing in a field. Deer B is located 60.6 m from deer A at an angle of 51.0 ° north of west. Deer C is located 78.8 ° north of east relative to deer A. The distance between deer B and C is 90.4 m. What is the distance between deer A and C? (Hint: Consider the laws of sines and cosines given in Appendix E.)
这道题有人会么？？ 谢谢谢谢！！！！
好像挺简单的。。就是忘了公式了。。

有三只鹿A、B、C在一块地上吃草。B与A 相距60.6米，角度为北偏西51.0 °；C与A 的角度为北偏东78.8 °；B与C的距离为90.4米。请问A与C的距离是多少？（提示：可考虑附录E中的正弦和余弦定理）