\(\widehat{ACB}=\dfrac{60^0}{2}=30^0\)
\(\widehat{BCA'}=180^0-60^0=120^0\)
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\(\widehat{ACB}=\dfrac{60^0}{2}=30^0\)
\(\widehat{BCA'}=180^0-60^0=120^0\)