Mik cần gấp ai làm được thì mik cảm ơn nhiều nhé.
\(a,\widehat{BIC}=180^0-\widehat{IBC}-\widehat{ICB}=180^0-\dfrac{1}{2}\left(\widehat{ABC}+\widehat{ACB}\right)=180^0-\dfrac{1}{2}\left(180^0-\widehat{BAC}\right)=180^0-\dfrac{1}{2}\cdot100^0=130^0\)
a: \(\widehat{BIC}=180^0-\dfrac{1}{2}\left(\widehat{ABC}+\widehat{ACB}\right)\)
\(=180^0-\dfrac{1}{2}\cdot100^0=130^0\)