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banyak putaran = 500 kali
jarak tempuh = 628 m = 62.800 cm
maka :
Keliling roda = panjang lintsn / jrk tempuh
= 62.800 / 500
= 125,6 cm
jadi :
K = π x d
125.6 = 3,14 x d
d = 125,6/3,14
d = 40 cm