高中数学题（有关圆扇形）

来源：百度知道 编辑：UC知道 时间：2024/06/06 07:49:25
扇形AOB的弧长是20π，在上边截取一段环ABCD做园台的侧面（不好意思，忘记原话怎么讲了）剩下部分截出最大的园 恰好做成圆台底面（较大的底面） 还知道圆台母线为30，求圆心角度数。 请些出过程，谢谢

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。。