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Verified answer
LingkaranO pusat lingkaran
AB = busur = 50,24 cm
AB = 50,24
144°/360° × keliling lingkaran = 50,24
12/30 × 2πr = 50,24
4/5 πr = 50,24
r = 5 × 50,24 / (4 × 3,14)
r = 20 cm