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banyak putaran = panjang lintasan / keliling
= 1.320.000 / ( 2 x (22/7) x 21)
= 10.000 kali
= 2 x phi x r
= 2 x 22/7 x 21
= 132 cm
Roda berputar sebanyak:
= 1320000 : 132
= 10000 kali