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Karena Bola II besarnya 4 kali lipat yang I....
Jadi 17 kali 4..... 68 hasilnya
roda 2 = 20 cm
Perbandingan jari-jari
5 : 20
1 : 4
Roda 1 = 17 putaran/menit
roda 2 = x putaran
Perbandingan putaran 17 : x
1:4
17:x
x= 17 x 4
= 68 putaran