HMMT 十一月 2012 · 冲刺赛 · 第 25 题
HMMT November 2012 — Guts Round — Problem 25
题目详情
- [ 13 ] Triangle ABC satisfies AB = 8, BC = 9, and CA = 10. Evaluate . sin B · sin C n
解析
- [ 13 ] 83 Answer: Using the Law of Sines, we have 80 2 2 2 sin B + sin C − sin A sin B sin C sin A sin A AC AB BC BC 83 = + − = + − = . sin B sin C sin C sin B sin B sin C AB AC AC AB 80