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D = 1,4 M = 140 cm
pi = 140 : 2 = 70
jarak kesekolah = 88 M
keliling roda sepeda = 2 x pi x r = 2 x 22/7 x 70 = 2 x 220 = 440 cm = 4,4 m
banyak putara roda = 88 m : 4,4 m = 20 kali perputaran