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⇔ Sudut Keliling [∠ACB] → 60°
⇔ Sudut Pusat → ∠AOB
≡ Penyelesaian:
⇒ Sudut Pusat = 2 × Sudut Keliling
⇒ ∠AOB = 2 × ∠ACB
⇒ ∠AOB = 2 × 60°
⇒ ∠AOB = 120°