1/2absinc是什么定理
三角形面积公式1/2absinc的图
三角形的面积=1/2absinc=1/2a2sinc=根号3,怎么算的a=2
2.余弦定理:a2= b2 c2-2bccosa a2 b2-2abcosc b2 c2 a2 2
1 bcsina 1 1 2 (4)s=2absinc=2acsinb=_________.
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