Jawabanmu

2014-01-15T21:20:28+07:00
1,57 km =157.000 cm
K roda = 3,14 * 80 = 251,2 cm
banyak putaran roda = 157.000 / 251,2 = 625 putaran
2014-01-15T21:27:59+07:00
Keliling roda = 3,14 x 80 = 251,2 cm
banyak putaran roda = 157000/251,2 = 625 putaran
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