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1 知识网络1)解三角形 :概念 ;类型 ;解法 .2 )正弦定理 :asinA=bsinB=csinC反映了三角形中注意两边与它们的对角的正弦成比例的关系 ;特例 :当C =90°时 ,sinA =ac ,sinB =bc .3)余弦定理 :a2 =b2 +c2 - 2bccosA(或cosA =b2 +c2 -a22bc )等反映了三角形中三边与一个角的余弦?
1 Knowledge Network 1) Solution Triangle: Concept; Type; Solution. 2) Sine Theorem: asinA=bsinB=csinC reflects the relationship between the sides of the triangle and their diagonal sine in a triangle; special case: when C = 90° , sinA = ac, sinB = bc .3) The cosine theorem: a2 = b2 + c2 - 2bccosA (or cosA = b2 + c2 - a22bc) etc. reflects the cosine of three sides of a triangle and an angle?