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Karena panjang jari-jari lingkaran itu sama, maka AOB merupakan segitiga sama kaki, sehingga:
∠ OBA = ∠ OAB = (180 - 104)/ 2 = 38°
Besar ∠DBC = ∠OBA = 38° (konsep kesebangunan)
Jawaban: C