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Penyelesaian:
Diket :
α = 120°
π = 22/7
Panjang busur = 88 cm
Ditanya :
r = ....?
Jawab :
α/360° × 2πr = Panjang busur
120°/360° × 2 × 22/7 × r = 88
1/3 × 44/7 × r = 88
44/21 × r = 88
r = 88 : 44/21
r = 88 × 21/44
r = 1748/44
r = 42 cm
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