正弦定理a/sinA=b/sinB=c/sinC=2R(三角形外接圆直径)
这样我们可以轻松解决已知一组对边角 求三角形最大面积的问题
余弦定理也主要是在立体几何和平面几何中做最后求解的工具
至于这两个推广公式 很少而且不实用


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