【C9培优】解三角形高考命题趋势不只是基础的正余弦定理，核心题型方法必须要了解（面积和相等、余弦和为零、作一条高线、定比分点法）必须了解四边形的很多定理
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【C9培优】解三角形高考命题趋势不只是基础的正余弦定理，核心题型方法必须要了解（面积和相等、余弦和为零、作一条高线、定比分点法）必须了解四边形的很多定理
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