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maka:
keliling lingkaran = panjang lintasan / jumlah putaran
= 1320 m / 1000 kali
= 1,32 m
= 132 cm
K = π . d
d = K / π
d = 132 / 3,14
d = 42,03 cm
r = 42,03 cm /2
= 21.01
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