Bài 8: \(sin\widehat{B}=\dfrac{AC}{BC}\) \(\Rightarrow\) \(\dfrac{AC}{BC}=sin30^o=\dfrac{1}{2}\) \(\Rightarrow\) BC=2AC.
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Bài 8: \(sin\widehat{B}=\dfrac{AC}{BC}\) \(\Rightarrow\) \(\dfrac{AC}{BC}=sin30^o=\dfrac{1}{2}\) \(\Rightarrow\) BC=2AC.