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= 13.200 cm
r = 21 cm
K = 2 × π × r
= 2 × 22/7 × 21
= 2 × 22 × 3
= 132 cm
Putaran = Jarak : Keliling roda
= 13.200 cm : 132
= 100
Jadi banyak putaran roda adalah 100.
K = 2 x 22/7 x 21
K = 44/7 x 21
K = 132 cm
132 m = 13.200 cm
Roda berputar sebanyak;
13.200/132
100 putaran