Ada sebuah roda yang berputar sebanyak 2000 kali dan menempuh jarak 0,4 km. tentukan jari" roda tersebut...
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2000 kali putaran = 40000 cm
1 kali putaran = keliling roda
1 kali putaran = 40000 cm / 2000
= 20 cm
K = 20 cm
K = π d
20 = 22/7 × d
d = 20:22/7
d = 20 × 7/22
d = 6.36 cm
r = d/2
r = 6.36/2
r = 3.18 cm