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Jarak = K roda x banyak putaran
125600 = 3,14 x 2r x 1000
2r =
2r = 40
r = 20
[cmiiw]
Putaran -----> 1000 kali
Lintasan = K x putaran
125600 = 2πr x 1000
125600/1000 = 2πr
125,6 = 2 . 3,14 . r
125,6 = 6,28 r
r = 125,6 : 6,28
r = 20 cm
Jadi, jari-jarinya adalah 20 cm.
Itu jawabannya.