Panjang busur AB = (<BOA / 360°) × 2 × phi × r
Panjang busur AB = (72°/360°)×2×3,14×30 = 0,2 × 2 × 3,14 × 30 = 37,68
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Panjang busur AB = (<BOA / 360°) × 2 × phi × r
Panjang busur AB = (72°/360°)×2×3,14×30 = 0,2 × 2 × 3,14 × 30 = 37,68