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KO x n = 660000 cm
2 x 22/7 x 42 x n = 660000 cm
264n = 660000 cm
n = 660000/264
n = 2500 putaran
s = 6,6 km = 660.000 cm
r = 42 cm
mka :
K = 2 x 22/7 x r
= 2 x 22/7 x 42
= 264 cm
jadi jumlh putaran roda = 660.000/264 = 2.500 kali