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jumlh putaran = 500 kali
panjang lintasan = 1.320 m = 132.000 cm
maka :
K roda = 132.000/500
= 264 cm
jadi :
K = 2 x 22/7 x r
264 = 44/7 x r
r = 264x7 / 44
r = 42 cm