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Verified answer
Panjang busur AB = (besar sudut AOB/360°) × 2πrpanjang busur AB = (72°/360°) × (2 × 3,14 × 16)
panjang busur AB = (1/5) × (100,48)
panjang busur AB = (100,48/5)
panjang busur AB = 20,096 cm