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Sepeda berputar = 1.500 kali
Keliling = 528.000 cm ÷ 1.500 = 352 cm
Keliling = π × D
352 cm = 22/7 × D
D = 7/22 × 353 cm = 112 cm
Jari - jari = 112 cm ÷ 2 = 56 cm