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9,42 = (30°/360°) × Luas Lingkaran
9,42 = 1/12 × Luas Lingkaran
Luas Lingkaran = 12 × 9,42
Luas Lingkaran = 113,04
π.r² = 113,04
3,14 × r² = 113,04
r² = 113,04 ÷ 3,14
r² = 36
r = 6 cm