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Verified answer
Sudut Pusat dan Sudut Keliling<AOB = <BOD - <AOD
<AOB = 180° - 80°
<AOB = 100°
Ingat, besar sudut keliling = sudut pusat dibagi dua jika menghadap busur yang sama.
Sehingga,
<ACD = <AOB : 2
<ACD = 100 : 2
<ACD = 50° (B).
*semoga membantu. sukses selalu ^_^