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Keliling roda : ↓
=> π.d
=> × 21
=> 66 cm.
Jarak tempuh : ↓
=> 99 meter.
=> 9900 cm.
Banyak roda putaran : ↓
=> 9900 ÷ 66
=> 150 kali putaran.
"Jadi, banyak roda tsb yg berputar sebanyak 150 kali putaran."